Question

Evaluate: 4a+7b+3a-2b for a=5 b=-3

Answer 1

Just plug in 5 for every "a" and -3 for every "b"

Answer 2

4(5) + 7(-3) + 3(5) - 2(-3)

Answer 3

is it 20 or 8?

Answer 4

Break it up into four parts:

4(5)
= 20
7(-3)
= -21
3(5)
= 15
2(-3)
= -6
So, your equation is now:
20 + (-21) + 15 - (-6)

Answer 5

so its 20 right {;

Answer 6

20 + (-21) = -1

-1 + 15 = 14
14 - (-6) = 14 + 6 = 20

Looks about right.