Question

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

Answer 1

Substitute `3` for `b`

Explanation:

`5a-10*3=45->5a-30=45->`

Add `30` on each side, later divide by `5`
`5a-cancel30+cancel30=45+30->5a=75->a=75/5=15`