Answer:
substitution
Step-by-step explanation:
y = - 2x + 9 → (1)
- 8x + 7y = - 3 → (2)
substitute y = - 2x + 9 into (2)
- 8x + 7(- 2x + 9) = - 3
- 8x - 14x + 63 = - 3
- 22x + 63 = - 3 ( subtract 63 from both sides )
- 22x = - 66 ( divide both sides by - 22 )
x = 3
substitute x = 3 into (1)
y = - 2(3) + 9 = - 6 + 9 = 3
solution is (3, 3 )
