Questions on Algebra: Systems of Linear Equations answered by real tutors!

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Question 185313: Solve by the Addition Method:
4x-5y=3y+4
2x+3y=2x+1
Click here to see answer by ankor@dixie-net.com(15746)

Question 185366: How do you solve this algebraic word problem graphically?
Student 1 and Student 2 went shopping at Staples. Student 1 got 2 boxes of pencils and 3 notebooks for 15 dollars. Student 2 got 3 boxes of pencils and 5 notebooks. how much is one box of pencils?
I know how to find the answer algebraically, but the graphing is messing me up. how do you make the linear equation from this???
Click here to see answer by stanbon(57967)

Question 185362: Fearful of bank failure, Norman split his life savings of $60,000 among three banks. He received 5%, 6%, and 7% on three deposits. In the account earning 7% interest, he deposited twice as much as in the account earning 5% interest. If his total earnings were $3,760, then how much did he deposit in each account?
Click here to see answer by stanbon(57967)

Question 185375: Hello my name is Aaliyah and I really need help on this problem.
2x-5y=-158
x-y=-40
But it will not show me how to do it or anything and really need it, because i am a 7th grader and i am really smart but just do not get this problem at all, and my math class is all 9th graders, only me and three other 7th grade girls are in this honorable class. So please help. Thankyou very much!!!!!!!!!!!!!!!
Click here to see answer by nerdybill(7008)

Question 185391: graph linear equation: y=x-2 please
Click here to see answer by vleith(2825)

Question 185456: Think i did them right but 2 & 3 are I get no solution and want to make sure I am not leaving something out.
1. Solve by substitution or elimination method:
3x – 2y = 26
-7x + 3y = -49
2. Solve by substitution or elimination method:
4x – 5y = 14
-12x + 15y = -42
3. Solve by substitution or elimination method:
-2x + 6y = 19
10x – 30y = -15

Click here to see answer by jim_thompson5910(28715)

Question 185460: when solving systems of linear equations I was taught to put it in y=ms+b form.
When graphing the equations I get mixed up as to go up or down or left or right for the lines. Ex: 2x-y = 6 x-y = 5 Am I adding y or subtrating x?
Click here to see answer by checkley77(12569)

Question 185578: y-2x-4
x=1/2y=2
would you help me??
Click here to see answer by stanbon(57967)

Question 185805: solve
x + 40/x = -13
Click here to see answer by checkley77(12569)

Question 185919: no idea where to even start....please help using excel.
Click here to see answer by solver91311(17077)

Question 185915: I need someone to complete the prob using excel, then I can do the other problems assisgned and see if I can use this one as a key to do the others.
Click here to see answer by solver91311(17077)

Question 186085: How do you solve this linear system with substitution?
8x+3y=0
-x-9y=92
All I have got to is...
x=-9y-92
3y(-9y-92)=0
-6y-92=0
-6y=92
I dont think I did it right??
Click here to see answer by josmiceli(9817)

Question 186063: Write an equation in slope-intercept form of the line satisfying the given conditions. The line passes through (2,4) and has the same y-intercept as the line whose equation is x - 4y = 8
Click here to see answer by hkelson(7)

Question 186082: 19. Solve each linear system. Write each coordinate to 2 decimal places.

Click here to see answer by Alan3354(31529)

Question 186056: begin by solving the linear equation for y. This will put the equation in slope-intercept form. Then find the slope and the y-intercept of the line with this equation. 3x - 4y = 12
Click here to see answer by hkelson(7)

Question 186280: Solve each system by graphing. If there is no solution or an infinite number of solutions, so state. Use set notation to express solution sets. y = 2x and Y = -x + 6
Click here to see answer by Alan3354(31529)

Question 186418: An Airplane flew for 4 hours against headwind of 40 km/h. On the
return flight the same wind was now a tail wind, and the flight took 3
hours. Find the speed of the airplane in still air
Click here to see answer by stanbon(57967)

Question 186461: Three brothers, Philip, Rafael and Brian live in a house. Philip can clean the hoouse twice times as fast as Brian. Rafael can clean the house in 8 hours. All three together, can clean the house in 2 hours. How long would it take Brian to clean the house.
Click here to see answer by stanbon(57967)

Question 186554: the length of a fence required to enclose a rectangular field is 3000 meters. what are the dimensions of the field if it is known that the difference between the length and width is 50 meters?
Click here to see answer by checkley77(12569)

Question 186460: blake travels in a boat 200 miles downstream in the same time that it takes to go 120 miles upstream. If the speed of the stream is 5 mph, find the speed of the boat in still water
Click here to see answer by checkley77(12569)

Question 186561: a movie theater charges $8.00 for adults, $4.50 for children, and $6.00 for senior citizens. one day the theatre sold 405 tickets and collected $2320 in receipts. there were twice as many children's tickets sold as adult tickets. how many adults, children, and senior citizens went to the theater that day?
Click here to see answer by stanbon(57967)

Question 186570: solve the system of equations using matrices( row operations). if the system has no solution, say that it is inconsistent
1/2x + y= -2
x -2y= 8
Click here to see answer by stanbon(57967)

Question 186595: x+y=8
3x=y
Click here to see answer by stanbon(57967)

Question 186643: in elmination how would i solve this:x+2y=-9
4x+2y=6
Click here to see answer by nerdybill(7008)

Question 186654: solve this ? (:
thanks !?
Click here to see answer by Alan3354(31529)

Question 186684: half of a certain number is subtracted from 26 and the result is then tripled, and the answer is 18. find the number
Click here to see answer by jim_thompson5910(28715)

Question 186710: please help me solve this: Solve these problems by elimination
1)3x-y=26 x+y=10
2)135x+45y=-11 81x-75y=13
3)x+2y=3 2x+4y=6
4)3x-5y=50 2x+4y=-18
Click here to see answer by checkley77(12569)

Question 187018: 10+x dividid 40+x find the value of x?
or
10+x
---- =?
40+x
Click here to see answer by rapaljer(4667)

Question 187101: Extrememly confused, help please!
Solve each system in three variables
14)2x-y+3z=14
x+y-2z=-5
3x+y- z=2

18) x-3y+2z=-11
2x-4y+3z=-15
3x-5y-4z=5
Click here to see answer by stanbon(57967)

Question 187098: CAN SOMEONE HELP ME WITH THIS PROBLEM? I AM A MATH DISASTER AND CANNOT FIGURE OUT HOW TO FIGURE THIS OUT? THANKS SO MUCH!
Different growth rates. The combined population of Marysville and Springfield was 25,000 in 2000. By 2005 the population of Marysville had increased by 10%, while Springfield had increased by 9%. If the total population increased by 2380 people then what was the poulation of each city in 2000?
Can anyone help me solve this problem by substitution

Click here to see answer by ankor@dixie-net.com(15746)

Question 187557: Can you help me solve this linear equation. please multiply and simplify and please show work.

(2x-5y^2)
Click here to see answer by solver91311(17077)

Question 187604: Factor the expression.
64x^6+y^6
(8x^2)^3+(y^2)^3
(8x^2+y^2)(8x^4-8x^2y^2+y^4)
Did I do this right?
Click here to see answer by user_dude2008(1861)

Question 187648: Draw a graph of the line passing through the points(-6,-7) and(-3,-5).Does the
point (3,-1)also lie on this line?

Click here to see answer by nerdybill(7008)

Question 187645: Solve for x and y graphically.
4x+2y=0
x-5y=-11
Click here to see answer by checkley77(12569)

Question 187752: Solve the system by the addition (elimination) method.
2x+y=7
3x+y=12
Click here to see answer by jim_thompson5910(28715)

Question 187853: Find the value of x if y= -14, m = -2, and b = -2 in the formula y = mx + b.

Could someone please help me solve this problem step by step, I know the awnser is x=6. Thank You
Click here to see answer by jim_thompson5910(28715)

Question 187937: i want to solve thisimultaneous equation 5x-5y=5,4x-3y=25
i took the first equation x=5+5y/5 and them
4(5-5y)/5-3y=25
i don´t understand the siplpification
Click here to see answer by checkley77(12569)

Question 187999: Solve each system of equations.
4x - 2y + 6z = 5
2x - y + 3z = 2
Click here to see answer by Alan3354(31529)

Question 187990: 3x - 4 = 10 for y
Click here to see answer by Alan3354(31529)

Question 188008: is y = 1/3x + 5 a linear equation when y=-3x + 5 is a linear equation?
Click here to see answer by solver91311(17077)

Question 188021: __
V = IIr^2h for h

the __ is suppossed to be a squiggly mark with two marks below it. and the 2 is squared
Click here to see answer by Alan3354(31529)

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