Answer:
(- 5, 5 )
Explanation:
5x + 7y = 10 → (1)
- 9x + y = 50 ( add 9x to both sides )
y = 9x + 50 → (2)
substitute y = 9x + 50 into (1)
5x + 7(9x + 50) = 10
5x + 63x + 350 = 10 ( subtract 350 from both sides )
68x = - 340 ( divide both sides by 68 )
x = - 5
substitute x = - 5 into (2)
y = 9(- 5) + 50 = - 45 + 50 = 5
solution is (- 5, 5 )