Question

Solve by linear combination

2x-3y=4,

x-3y=8

write your answer as an ordered pair, with no spaces (x,y)

Answer 1

Hello!

x - 3y = 8

x = 8 + 3y

2x - 3y = 4

2(8 + 3y) - 3y = 4

16 + 6y - 3y = 4

16 + 3y = 4

3y = 4 - 16

3y = -12

y = -12/3

y = -4

x - 3y = 8

x - 3*(-4) = 8

x + 12 = 8

x = 8 - 12

x = -4

(-4,-4)