Question

Solve the system of equations:
x + 2y = -3; x - y = -12

a) x = 3, y = 15
b) x = -7.y = 5
c) x = -9, y = 3
d) x = 9, y = 6​

Answer 1

Answer:

c

Step-by-step explanation:

x+2y+3 = 0 ---A

x-y + 12 =0 ---B

A-B=

x +2y+3 =0

x- y +12=0

- + -

_________

3y- 9 =0

__________

y= 9/3 = 3

substitute y=3 in B

x-3+12=0

x= -9