Answer:
(- 3, 4 )
Explanation:
x + y = 1 ( subtract x from both sides )
y = 1 - x → (1)
2x - y = - 10 → (2)
Substitute y = 1 - x into (2)
2x - (1 - x) = - 10 ← distribute parenthesis and simplify left side
2x - 1 + x = - 10
3x - 1 = - 10 ( add 1 to both sides )
3x = - 9 ( divide both sides by 3 )
x = - 3
substitute x = - 3 into (1)
y = 1 - (- 3) = 1 + 3 = 4
solution is (- 3, 4 )