Answer:
40+11q
Step-by-step explanation:
5x+qy
5(8)+q(11)=40+11q
You know that two expressions are equivalent when if you substitute in your values and simply the expressions, they have the same answer.
Answer: 4
Step-by-step explanation:
x - 2y =10
x = 10 + 2y



... cancel like terms (y + 5)
= 4