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# Recent problems solved by 'Alan3354'

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 Graphs/705135: How do I graph y-2x=-4. I don't understand how I know where to put it on the graph. thank you1 solutions Answer 434421 by Alan3354(30983)   on 2013-01-22 22:12:56 (Show Source): You can put this solution on YOUR website!How do I graph y-2x=-4. I don't understand how I know where to put it on the graph. ------------ It's a straight line, so you need to plot 2 points. y-2x=-4 y = 2x - 4 Pick 2 values of x and find y, eg x = 0, y = -4 --> (0,-4) Pick another value for x. Plot the 2 points, draw a line thru them.
 test/705078: Suppose you invested \$500 in an account. The account pay 4% interest compounded annually. Find the account balance in one hundred years?1 solutions Answer 434416 by Alan3354(30983)   on 2013-01-22 21:20:45 (Show Source): You can put this solution on YOUR website!Suppose you invested \$500 in an account. The account pay 4% interest compounded annually. Find the account balance in one hundred years? ------------
 Linear-equations/705096: How to simplify 1/(x+7/2). I cannot figure this part out while working on an equation.1 solutions Answer 434415 by Alan3354(30983)   on 2013-01-22 21:19:28 (Show Source): You can put this solution on YOUR website!How to simplify 1/(x+7/2). I cannot figure this part out while working on an equation. -------------- 1/(x + 7/2) is "simple." "Simplified" can be a matter of opinion. Stop working on the equation, whatever it might be, and work on this.
 Expressions-with-variables/705102: Solve by elimination 3y-4x=29 2y+5x=41 solutions Answer 434413 by Alan3354(30983)   on 2013-01-22 20:48:04 (Show Source): You can put this solution on YOUR website!Solve by elimination 3y-4x=29 2y+5x=4 --------------- Multiply the 1st eqn by 2, and the 2nd eqn by -3, then add
 Linear-equations/705088: (-7,5) (3,r)= 4/3 With this type of problem am I looking for 'r' or just over all slope? The answer I got when working it out was -55/3. I'm not sure if I even used the right formula while solving this.1 solutions Answer 434412 by Alan3354(30983)   on 2013-01-22 20:47:03 (Show Source): You can put this solution on YOUR website!(-7,5) (3,r)= 4/3 With this type of problem am I looking for 'r' or just over all slope? The answer I got when working it out was -55/3. I'm not sure if I even used the right formula while solving this. ------------------- If you don't know what you want to do, your chances of doing it are slim.
 Subset/705097: 5x-4y=-6 X-2y=-6 1 solutions Answer 434411 by Alan3354(30983)   on 2013-01-22 20:45:39 (Show Source): You can put this solution on YOUR website!5x-4y=-6 X-2y=-6 ---------- Do you have a question?
 Expressions-with-variables/705099: Solve by elimination x-2y=-7 4x+2y=221 solutions Answer 434410 by Alan3354(30983)   on 2013-01-22 20:44:59 (Show Source): You can put this solution on YOUR website!Solve by elimination x -2y=-7 4x+2y=22 --------- Add
 Graphs/705020: y=x-4 (I know the answer would be 4,-4, but I'm not sure why that would be correct. Please help1 solutions Answer 434397 by Alan3354(30983)   on 2013-01-22 18:41:10 (Show Source): You can put this solution on YOUR website!y=x-4 (I know the answer would be 4,-4, but I'm not sure why that would be correct. ------------- y = x - 4 has an infinite # of "answers" Pick a number for x and find y. ----------- As for (4,-4), that's not one of them If x = 4, then y = 4-4 = 0 --> (4,0) -------------- If you graph it, you get a straight line, and every point on it is a solution, or answer.
 Linear-equations/704966: (2,-2) (-3,8) what is the equation for y=mx+b for these point1 solutions Answer 434364 by Alan3354(30983)   on 2013-01-22 17:29:32 (Show Source): You can put this solution on YOUR website!(2,-2) (-3,8) what is the equation for y=mx+b for these point --------------- There is no equation for y = mx + b except y = mx + b. Try English, if you speak it. Make sense.
 Equations/704968: May you show a detailed process to solve x-8y=18 and -16+16y =18 using elimination. I tried the first equation by making the first equation opposites by multiplying the first equation times two. What needs to take place after making the equations opposites. 1 solutions Answer 434363 by Alan3354(30983)   on 2013-01-22 17:27:35 (Show Source): You can put this solution on YOUR website!May you show a detailed process to solve x-8y=18 and -16+16y =18 using elimination. I tried the first equation by making the first equation opposites by multiplying the first equation times two. What needs to take place after making the equations opposites. --------------- The 2nd eqn has no x term.
 Trigonometry-basics/704809: cot 36`1 solutions Answer 434275 by Alan3354(30983)   on 2013-01-22 10:47:28 (Show Source): You can put this solution on YOUR website!cot 36 ---------- = 1/tan(36) Calculator work from there.
 Equations/704795: 3x-4=0 isnt this 3x=4 then x=3/4? The solution says its 1 1/3 or 4/3 but that isnt right? Please help fast. Thanks!1 solutions Answer 434270 by Alan3354(30983)   on 2013-01-22 09:54:40 (Show Source): You can put this solution on YOUR website!3x-4=0 isnt this 3x=4 then x=3/4? ------------ 3x-4=0 isnt this 3x=4 is right. Then divide both sides by 3 x = 4/3
 Exponents/704648: which solution is positive a) -2^2 b) (-2)^3 c)(-2)^4 d)(-2)^51 solutions Answer 434201 by Alan3354(30983)   on 2013-01-21 21:06:49 (Show Source): You can put this solution on YOUR website!which solution is positive a) -2^2 b) (-2)^3 c)(-2)^4 d)(-2)^5 --------------- Multiply them and find out. a) -2^2 = -(2*2) ----------- b) (-2)^3 = -2*-2*-2 ------------ c)(-2)^4 d)(-2)^5
 Equations/704650: if y=17.5 when x=21, find y when x=81 solutions Answer 434198 by Alan3354(30983)   on 2013-01-21 20:56:44 (Show Source): You can put this solution on YOUR website!if y=17.5 when x=21, find y when x=8 -------------- Not enough info.
 Linear-systems/704624: solve this (-2,8),(r,4), m=-1\21 solutions Answer 434191 by Alan3354(30983)   on 2013-01-21 20:36:12 (Show Source): You can put this solution on YOUR website!solve this (-2,8),(r,4), m=-1\2 --------------- Solve for what?
 Polynomials-and-rational-expressions/704635: Please help me explain to my daughter how to solve in simplest form the equation 7/9w = 7 Thank you1 solutions Answer 434190 by Alan3354(30983)   on 2013-01-21 20:35:07 (Show Source): You can put this solution on YOUR website!Please help me explain to my daughter how to solve in simplest form the equation 7/9w = 7 ------------- Not sure what "solve in simplest form" means. -------- Solve for w 7/9w = 7 Is it (7/9)w? or 7/(9w)? Makes a difference.
 Linear-equations/704633: Write the equation in the slope-intercept form. y − 2 = 01 solutions Answer 434189 by Alan3354(30983)   on 2013-01-21 20:33:17 (Show Source): You can put this solution on YOUR website!Write the equation in the slope-intercept form. y − 2 = 0 ---------------- y = 0x + 2
 Equations/704632: please help me solve this equation!! y=2x and 2y=-x=4 1 solutions Answer 434188 by Alan3354(30983)   on 2013-01-21 20:32:12 (Show Source): You can put this solution on YOUR website!y=2x and 2y=-x=4 ------------- It's not an equation, it's 2 equations. ---------- but, 2y=-x=4 --> too many equal signs
 Trigonometry-basics/704567: 2cos(x) - sec(x) = 1 My work i dont know if this is right?? 2cos(x) - (1/cos(x))=1 2cos(x^2) -1 / cos =1 -2sin(x^2) /cos =1 i do not know where to go from there 1 solutions Answer 434187 by Alan3354(30983)   on 2013-01-21 20:30:55 (Show Source): You can put this solution on YOUR website! 2cos(x) - sec(x) = 1 My work i dont know if this is right?? 2cos(x) - (1/cos(x))=1 2cos(x^2) -1 / cos =1 *************It's not x^2, it's cos^2************* ---------------- 2cos^2 - 1 = cos 2cos^2 - cos - 1 = 0 (2cos + 1)*(cos - 1) = 0 cos = 1 x = 0 + n*180 degs, n = +/1 0,1,2,3... ------------- 2cos = -1 x = 120 + n*360 n = +/1 0,1,2,3... x = 240 + n*360 n = +/1 0,1,2,3...
 test/704599: ORDER THE NUMBERS FROM LEAST TO GREATEST 0.8,22/25,87%1 solutions Answer 434176 by Alan3354(30983)   on 2013-01-21 19:47:37 (Show Source): You can put this solution on YOUR website!ORDER THE NUMBERS FROM LEAST TO GREATEST 0.8,22/25,87% ------------- Change the all to decimal. Stop using all CAPS.
 Trigonometry-basics/704577: An electrician is carrying a ladder horizontally around a corner from one hallway to another. One hallway is a foot wider than the other. If theta = 30 degrees find the exact value of the length of the ladder.1 solutions Answer 434160 by Alan3354(30983)   on 2013-01-21 18:29:53 (Show Source): You can put this solution on YOUR website!An electrician is carrying a ladder horizontally around a corner from one hallway to another. One hallway is a foot wider than the other. If theta = 30 degrees find the exact value of the length of the ladder. ------------ I have no idea. Can you ask him?
 Bodies-in-space/704571: The radius of a sphere and of a cylinder are the same. The diameter of the sphere and the height of the cylinder are also the same and are twice the length of the radius. If two cones are formed within the cylinder, as shown in the diagram, then the volume of the sphere is equal to which of the following?1 solutions Answer 434158 by Alan3354(30983)   on 2013-01-21 18:24:59 (Show Source): You can put this solution on YOUR website! The radius of a sphere and of a cylinder are the same. The diameter of the sphere and the height of the cylinder are also the same and are twice the length of the radius. If two cones are formed within the cylinder, as shown in the diagram, then the volume of the sphere is equal to which of the following? --------------- There's no diagram, and nothing follows.
 Trigonometry-basics/704572: how do I verify that 1-cos(x^2) / 1 + cos(x^2) = sin(x^4)1 solutions Answer 434157 by Alan3354(30983)   on 2013-01-21 18:22:59 (Show Source): You can put this solution on YOUR website!how do I verify that 1-cos(x^2) / 1 + cos(x^2) = sin(x^4) ------------- Is it ? or ?
 Travel_Word_Problems/704456: A car is traveling at a speed of 60 miles per hour. How many hours will it take for the car to travel a distance of 240 miles?1 solutions Answer 434090 by Alan3354(30983)   on 2013-01-21 14:04:04 (Show Source): You can put this solution on YOUR website!A car is traveling at a speed of 60 miles per hour. How many hours will it take for the car to travel a distance of 240 miles? ----------------- d = r*t t = d/r
 Graphs/704458: Use the slope and y-intercept to graph the linear function. y = -6x ( can you tell me where I would need to graph the line) I can't figure out how to make a graph on here, so if you have a link or something to show me how to write this on a graph I would appreciate it. 1 solutions Answer 434088 by Alan3354(30983)   on 2013-01-21 14:02:29 (Show Source): You can put this solution on YOUR website!Use the slope and y-intercept to graph the linear function. y = -6x ------------------ The y-intercept is zero, the Origin (0,0). y = -6x + 0 in slope-int form. ---------------------- (0,0) is one point. For each increase in x of 1, y changes -6 On the x-y plane, count 1 to the right and 6 down for the 2nd point. Draw a line thru them.
 Graphs/704451: What is y=¾+2 written in standard form using integers?1 solutions Answer 434084 by Alan3354(30983)   on 2013-01-21 13:49:07 (Show Source): You can put this solution on YOUR website!What is y=¾+2 written in standard form using integers? ------------ y = 2 3/4 4y = 11
 Linear-equations/704441: How do you graph y=x+41 solutions Answer 434083 by Alan3354(30983)   on 2013-01-21 13:48:15 (Show Source): You can put this solution on YOUR website!How do you graph y=x+4 --------------- It's a straight line, you need 2 points. Pick 2 values for x and find y. Plot the 2 points. Draw a line thru them.
 Travel_Word_Problems/704397: A train leaves and travels north at 85 km per hour. Another train leaves at the same time and travels S at 55 km per hour. How long will it take before they are 560 km apart?1 solutions Answer 434065 by Alan3354(30983)   on 2013-01-21 11:23:29 (Show Source): You can put this solution on YOUR website!A train leaves and travels north at 85 km per hour. Another train leaves at the same time and travels S at 55 km per hour. How long will it take before they are 560 km apart? -------------------------- The speeds are added when going in opposite directions. ---- d = r*t t = d/r
 Linear-equations/704392: Determine if these points are parallel, perpendicular, or neither. 3x-4y=2 and 4x-3y=3 1 solutions Answer 434063 by Alan3354(30983)   on 2013-01-21 11:18:20 (Show Source): You can put this solution on YOUR website!Determine if these points are parallel, perpendicular, or neither. 3x-4y=2 and 4x-3y=3 -------------------- Those are not points, they're equations of straight lines. ---- Solve for y: 3x-4y=2 y = (3/4)x - 1/2 Slope m = 3/4 ------------- 4x-3y=3 y = (4/3)x - 1 m = 4/3 ============ Equal slopes --> parallel Inverse negative reciprocal slopes --> perpendicular ======= 3/4 & 4/3 are reciprocals, but not negative --> neither
 test/704399: What is 4b if b is 51 solutions Answer 434061 by Alan3354(30983)   on 2013-01-21 11:14:08 (Show Source): You can put this solution on YOUR website!What is 4b if b is 5 -------------- 4b = 4*5
 Triangles/704333: the base of the is 6 cm.If the area of the triangle is 30 sq cm. Find it's altitude1 solutions Answer 434060 by Alan3354(30983)   on 2013-01-21 10:56:27 (Show Source): You can put this solution on YOUR website!the base of the is 6 cm.If the area of the triangle is 30 sq cm. Find it's [sic] altitude -------------- 30 = 6*h/2 = 3h 3h = 30 h = 10 cm ================= it's = it is