Question

What is the value of a in the equation 5a-10b=45 , when b=3 ?

Answer 1

a = 15

Explanation:

`\text{Put b = 3 to the equation}\ 5a-10b=45\ \text{and solve for}\ a:\\\\5a-10(3)=45\\5a-30=45\qquad\text{add 30 to both sides}\\5a=75\qquad\text{divide both sides by 5}\\a=15`

Answer 2

a = 15

Explanation:

Plug in b = 3 into 5a-10b=45

5a-10(3) =45

5a - 30 = 45

5a = 75

a = 15