4a=12+8b substitution method problem step by step

Question

A-2b=3 substitution method step by step

Answer 1

I am going to assume (and you know what that does) that the upper case A in the second equation is meant to be a lower case a.

Now divide the first equation by 4 to get directly an equation for a.

Take that expression and substitute it directly into the second equation.

Collect terms and solve for b.

The go back to the equation for a and compute it with the value of b you got.