Answer:
- 1 and 63
Step-by-step explanation:
(2)
Given
- 6x + 9y - z ← substitute x = - 4, y = - 2 , z = 7 into the expression
= - 6(- 4) + 9(- 2) - 7
= 24 - 18 - 7
= - 1
(3)
Given
- 9(x + y) ← substitute x = 4 and y = - 11 into the expression
= - 9(4 + (- 11))
= - 9(4 - 11)
= - 9(- 7)
= 63
