SOLUTION: given: 3x-8 = -1 and -5x + 8y = 7, solve for x and y A. (5,2) B. (-3, -1) C. (13, 5) D. (3, -1) I know the answer is B but I do not know how to reach that solution.

Algebra ->  Equations -> SOLUTION: given: 3x-8 = -1 and -5x + 8y = 7, solve for x and y A. (5,2) B. (-3, -1) C. (13, 5) D. (3, -1) I know the answer is B but I do not know how to reach that solution.       Log On


   

Question 620541: given: 3x-8 = -1 and -5x + 8y = 7, solve for x and y
A. (5,2)
B. (-3, -1)
C. (13, 5)
D. (3, -1)
I know the answer is B but I do not know how to reach that solution.

Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 

Hi

Assume it was: 3x-8y = -1

given: 3x-8y = -1 and -5x + 8y = 7, solve for x and y 

 3x - 8y = -1

-5x + 8y = 7

  -2x = 6

    x = -3   and  y = -1      (-9 - 8y = -1,  -8y = 8,  y = -1)

Ordered pair ( -3, -1) the solution for this System

CHECKING our Answer***

-5x + 8y = 7

 15 - 8 = 7