# Math

posted by .

5x+3y=-11, 7x-2y=19 solve by elimination.
Sol'n:
5x+3y = -11 ---(1)x 2, 10x + 6y = -22 ----(1')
7x-2y = 19 ---(2)x 3, 21x - 6y = 57 ----(2')
31x = 55, divide by 31 on both side to obtain the value of x,
x = 35/31
then find y: from (2)
7(35/31) - 19 = 2y
2y = -344/31, then divide by 2 on both side to obtain the value of y.
y = -172/31
thus
x = 35/31 and y = -172/31 <----- answer
How do you get -344/31 in this problem?

• Math -

the steps are correct.

from
7x-2y=19
7x - 19 = 2y
7(35/31) - 19 = 2u
245/31 - 589/31 = 2y
-344/31 = 2y
-172/31 = y

• Math -

how did you get -589?

• Math -

19/1 = ?/31

• Math -

Thank you so much I have been working on this problem 308 times and can not figure this out

• Math -

344.80 spebds of it 3/4

## Similar Questions

1. ### math

how to work out -9x+17-10x=-21x+23 its 43 duhhhhhhhhhhhhhhhhhhhh that isn't worked outttttttttttttttttttttttttt!~ It's not worked out - nor is her answer correct. So if someone says, "duhhhhhh," don't feel too badly. She obviously …
2. ### Algerbra

how do you solve 7(3x+4)=8(2x+5)+13 expand the parenthesis...I will do the left side.. 21x + 29= Now, subtract sixteen x from both sides, and subtract 28 from both sides. I will be happy to check your work. 7(3x+4)=8(2x+5)+13 21x + …
3. ### Algebra

How do I solve for the elimination method: 5x + 3y= -7 and 7x - 2y =13 (step 1); 10x + 6y =-14 and 21x -6y = 39 ( step 2), 31x/31= 25/31, x= 25/31 (step 4). But after that I get lost. Can somebody help me out please.

5. ### algebra 1

Use elimination to solve the the system of equations given by 10x-4y=-20 and 10x-5y=35. I can't figure this one out. Whenever I check my work, it is incorrect.

7. ### math

Solve using elimination method -7x+5y=-56;-21x-2y=-168
8. ### Algebra

3x^8 – 7x^8 A.-4x^16 B.–21x^8 C.–4x^8 D.10x^8 I think this is C...just making sure you don't add the exponents...?
9. ### Math

5 -2x-1 = x+2 ____. ____ 4. 3 I keep getting x=5.5 Multiply by 12 60-3(2x-1)=4(x+2) 60-6x-3 =4x+8 63-6x=4x+8 Add the -6x 63=10x+8 Subtract the 8 55=10x Divide 10 X=5.5
10. ### MATH

5x-4y= -3 2x + 7y= 5 How to solve this linear system shown above by using elimination strategy ?

More Similar Questions