Questions on Algebra: Linear Equations, Graphs, Slope answered by real tutors!

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Question 263757: Translate the problem into a pair of linear equations in two variables.Solve the equations using either elimination or substitution.
Problem:
A contractor mixes concrete from bags of pre-mix for small jobs. How many bags with 7% cement should he mix with 10 bags of 15.5% cement to produce a mix containing 12% cement?
Click here to see answer by jsmallt9(3758)

Question 263820: 9(2x+8)=20-(x+5)
Click here to see answer by mananth(16946)

Question 263818: Factor Completly:
p^3-2p^2-9p+18
Click here to see answer by stanbon(75887)

Question 263896: given the linear equation y=-3/4x+11
Then the slope WRITTEN WITH EXACTLY 3 DECIMAL PLACES (this is THREE digits After the decimal, of any line that is parallel to this line would always be___________.
Click here to see answer by richwmiller(17219)

Question 263884: How do you solve the equation, 5/7x+1/3=2/5-2/7x+2/5
Click here to see answer by unlockmath(1688)

Question 264194: In which quadrant is the point (3,-14) located?
I or II or III or IV ?
Thank you for your help!
Click here to see answer by rfer(16322)

Question 264154: Could you please help me get started with this problem? Recycled 38 in 1990, 45 in 1991, 45 in 1992, 47 in 1994, 60 in 2001. slope intercept form is y=2.1x+37. y=recycled numbers x= year number coded as 1990=1, 1992=3, 1994=5, 2001=12. Is slope negative or postive? Calculate x-intercept year, what is it and what is the meaning of this point for the data?
If you could help me get started I would really appreciate it. I have gotten totally confused. Thank you
Click here to see answer by checkley77(12844)

Question 264308: I am doing a problem on my math homework that says Write equation of line that passes through (8,-6) and is perpendicular to the line 6x - 3y = 6 Write answer in slope intercept form. How do I do that?
Click here to see answer by Alan3354(69443)

Question 263599: How do I find an equation of the line that contains the point (1,0) and is perpediclar to 2x+y=-4?

Click here to see answer by Alan3354(69443)

Question 264411: What is the solution of y= x+4, and y= -2x+ 1
Click here to see answer by stanbon(75887)

Question 264426: How do you solve 2y=5x-1 and x=y+2? (Solve by graphing)
How do you solve x=5 and 3y=2x-1 (Solve by graphing)
How do you solve y=4 and 2x-y=1 (Solve by graphing)
How do you solve y-5x=10 and x-5y=10 (Solve by graphing)
i don't understand how to do these!:(
Click here to see answer by Alan3354(69443)

Question 264423: How do I find the slope of f(0)=4, f(4)=0?
Click here to see answer by stanbon(75887)

Question 264471: What is y=5x+4, (0,0)

Click here to see answer by Alan3354(69443)

Question 264471: What is y=5x+4, (0,0)

Click here to see answer by rfer(16322)

Question 264455: what is the linear equation of a line with a slope of -2/7 that passes through the point (8,-7)
Click here to see answer by vksarvepalli(154)

Question 264486: A catering service placed an order for eight centerpieces and five glasses, and the bill was $106. For the wedding reception it was short one centerpiece and six glasses and had to reorder. This order came to $24. Let x represent the cost of one centerpiece, and let y represent the cost of one glass.
Write an equation using x and y that represents the cost of the first order.

Write an equation using x and y that represents the cost of the second order.

The equations in parts a and b form a system of two linear equations that can be used to determine the cost of a single centerpiece and a single glass. Write this system below.

Solve the system using the substitution method.

Use the addition method to check your result in part d.

Use the solution to the system to determine the cost of 15 centerpieces and 10 glasses.

Click here to see answer by stanbon(75887)

Question 264488: find the equation of the line perpendicular to y=-7/5x+100, passing through the points (-14,-52)
Click here to see answer by CharlesG2(834)

Question 264551: 4x+y=12
Click here to see answer by Alan3354(69443)

Question 264636: what is the slope intercept form of x-6y=0
Click here to see answer by checkley77(12844)

Question 264647: I don't understand this concept. Please help.
Write the equation of the line that passes through each pair of points in slope-intercept form.
1. (5, -1) and (-7, -4)
2. (5,1) and (-1, -5)
3. (4,9) and (-5,3)
Click here to see answer by checkley77(12844)

Question 264700: Find the equation of the linear function g whose graph is perpendicular to the line 2x � 9y = �45; the two lines intersect at x = 18.
The answer that I keep coming up with is y=-9/2x+81. This is an online problem that I need to submit and it keeps telling me that I'm incorrect! The only thing that I can think that I may be doing wrong is that I'm using the point (18,0) because that's where the lines intersect. What am I doing wrong???
Click here to see answer by solver91311(24713)

Question 264837: I NEED HELP:
IDENTIFY THE SLOPE,m,and the y-intercept,b for each line
1. 3x + 4y = 6
2. 3/4x + 2y = -3
3. -2x - y = 4
4. 15x + 5y = -35
Click here to see answer by JBarnum(2146)

Question 265052: what is the solution of y= -x -3 for the given value of x
you put -1 insted of x
Click here to see answer by Earlsdon(6294)

Question 265006: At 11am, billy and leon set off towards each other from different places 32km apart. billy cycled at 20 km per hour and leon walked at 5km per hour.
draw distance time graphs of their journeys on the same grid to find out:
1. the time at which they met
2. the time at which they are 12km apart.
Click here to see answer by ankor@dixie-net.com(22740)

Question 265128: What are the x and y intercepts for the linear equation 2x + 3y = 15?

Click here to see answer by JBarnum(2146)

Question 265148: There are three grades of flooring adhesive. The first cost twice asmuch as the second, and the second costs three times as much the thitd. If you purchase one of each, the cost is $45. how muchis the most expensive adhesive?

Click here to see answer by palanisamy(496)

Question 265229: 4x+3y=8
4x+3y=5
do these lines parallel, perpendicular, or neither
Click here to see answer by drk(1908)

Question 265229: 4x+3y=8
4x+3y=5
do these lines parallel, perpendicular, or neither
Click here to see answer by Alan3354(69443)

Question 265261: How would you rearrange the folloowing equation : 3x-2y=15 ? I dont need to solve it, just how to rearrange it?
Click here to see answer by drk(1908)

Question 265360: Passing through (-2,-7) and parallel to the line whose equation is y = -5x + 4
can you please explain to me a little better my instructor is all over the place.
Click here to see answer by stanbon(75887)

Question 265450: My question is about slope. If you have two lines, is it always true that the line with the largest slope gives the largest output? Does the line with the largest slope ever achieve the largest output? I understand that slope tells how "steep" the line is, but how do you tell which line will have the largest output just by the slope? Any help would be greatly appreciated!
Click here to see answer by richwmiller(17219)

Question 265457: I'm trying to solve for a point of intersection between two functions. I think that to solve for the x-intercept, you have to set the two equations equal to each other and solve, but I'm not sure how to solve the two functions that I have. They are (x/60)*15+38 and (x/60)*7+46
Any help with this problem would be greatly appreciated!!!
Click here to see answer by Alan3354(69443)

Question 265434: The equation of the line which contains the point (5,10) and is perpendicular to the line through(5,10) and (25,0) has y�intercept (0, b). What is b?
Click here to see answer by Alan3354(69443)

Question 265485: 5x � 2y = 4
how do you do slope

Click here to see answer by stanbon(75887)

Question 265485: 5x � 2y = 4
how do you do slope

Click here to see answer by roseo(33)

Question 265493: what are two points on a line where the slope is -5/4, and the y-intercept is (0,4)?
Click here to see answer by rfer(16322)

Question 265532: Write the equation of a line that goes through the point (3,7) and is perpendicular to the line x=4
Click here to see answer by roseo(33)

Question 265544: The formula s = 16t2 is used to approximate the distance s, in feet, that an object falls freely (from rest) in t seconds. Use this formula to solve the problem.
How long would it take an object to fall freely from a bridge 725 feet above the water?
Click here to see answer by Alan3354(69443)

Question 265519: what is the slope of this equation y=-36 x +23
Click here to see answer by Alan3354(69443)

Question 265553: Write the equation in standard form of the line satisfying the given conditions. Through (-2,4); m= -3/4
I'm assuming you use point-slope form. y-y1= m(x-x1)
But I came up with a different answer than the book. The book says the answer is 3x+4y=10
How do you get that answer?
Click here to see answer by Alan3354(69443)

Question 265540: Walt made an extra $5000 last year from a part-time job. He invested part of the money at 6% and the rest at 10%. He made a total of $420 in interest. How much was invested at 10%?
Click here to see answer by josmiceli(19441)

Question 265577: Find an equation of the line containg the giveen pait of points: (1/6,-1/3 and (5/6,3)
Click here to see answer by Alan3354(69443)

Question 265599: Can help me please?
Find an equation in standard form for the line described.
- Through Q(-3,2) and parallel to the line containing (2,3) and (1,-2)
THANKS FOR ALL YOUR HELP!

Click here to see answer by josmiceli(19441)

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