Question

What is the sum of a and b?

Answer 1

Answer:

a=13, b=7

Step-by-step explanation:

You can use the exponent rule

$3x^{a-5}y^{9-b}=3x^{8}y^{2}$

so $x^{a-5}=x^{8}$ so

a-5=8

a=13

$y^{9-b} =y^{2}$ so

9-b=2

b=7