# Algebra

posted by .

Use the substitution method to solve the linear system.

1/8p+3/4q=7
3/2p-q=4

Thanks.

• Algebra -

1st times 8 ----> p + 6q = 56 or p = 56-6q

2nd times 2 ---> 3p - 2q = 8

3(56-6q) - 2q = 8
168 - 18q - 2q = 8
-20q = -160
q = 8

then p = 56-6(8) = 8

p= 8 and q = 8

Notice how for both of your last two posts, I got rid of fractions to make the equations much more manageable.

## Similar Questions

1. ### algebra

how do you use the substitution method to solve the linear system?
2. ### algebra 1

use the substitution method to solve the linear system. 9x+6y=3 3x-7y=-26 please show me an example of how to do it.
3. ### algebra

Requesting help. (I must reckon, that X is a variable, and y is y-intercept) Q: Try to use the substitution method to solve the the linear system y=3x an y=3x-7. What do you notice?
4. ### maths

use the substitution method to solve the linear system. 1. 3x=9 -x+2y=9 3x/3 = 9/3 x = 3 -x(3)+2y = 9 -3+2y = 9 2y = 12 y = 6 is (3,6) correct?
5. ### Algebra

-3x + 2y = 8 x + 4y = -4 use substitution method to solve the linear system.
6. ### algebra

use method of substitution to solve the system of linear equation 3x+4y=3/2 y=2x-1
7. ### algebra

use method of substitution to solve the system of linear equations. 2x-y=3 9x-4y=14 is the solution an ordered pair(,)
8. ### algebra

Use the substitution method to solve the linear system. Thanks! s= t+4 2t+s=19
9. ### Algebra

Use substitution method to solve the linear system. Can someone please check if I did this problem right?
10. ### Algebra

Solve this system of linear equations. * Used the substitution method 3x - y = 8 4x - y = -15 ----------------------------------------- WORK y = 3x - 8 4x - (3x - 8 ) = -15 4x - 3x + 8 = -15 x + 8 = -15 x = -7 3x - y = 8 3(-7) - y …

More Similar Questions