Answer:
(17, - 5 )
Explanation:
- 5x - 5y = - 60 → (1)
- 2x + y = - 39 → (2)
multiplying (2) by 5 and adding to (1) will eliminate y
- 10x + 5y = - 195 → (3)
add (1) and (3) term by term to eliminate y
(- 5x - 10x) + (- 5y + 5y) = - 60 - 195
- 15x + 0 = - 255
- 15x = - 255 ( divide both sides by - 15 )
x = 17
substitute x = 17 into either of the 2 original equations and solve for y
substituting into (2)
- 2(17) + y = - 39
- 34 + y = - 39 ( add 34 to both sides )
y = - 5
solution is (17, - 5 )