Answer:
(- 1, 7 )
Explanation:
Given the 2 equations
3x - 4y = - 31 → (1)
- 3x - 3y = - 18 → (2)
Adding the 2 equations term by term will eliminate x, that is
0 - 7y = - 49
- 7y = - 49 ( divide both sides by - 7 )
y = 7
Substitute y = 7 into either of the 2 equations and solve for x
Substituting into (1)
3x - 4(7) = - 31
3x - 28 = - 31 ( add 28 to both sides )
3x = - 3 ( divide both sides by 3 )
x = - 1
solution is (- 1, 7 )