Answer:
(- 21, - 13 )
Step-by-step explanation:
- 3y + x = 18 → (1)
x = 2y + 5 → (2)
substitute x = 2y + 5 into (1)
- 3y + 2y + 5 = 18
- y + 5 = 18 ( subtract 5 from both sides )
- y = 13 ( multiply both sides by - 1 )
y = 13
substitute y = - 13 into (2)
x = 2(- 13) + 5 = - 26 + 5 = - 21
solution is (- 21, - 13 )
