Question

the work of a student to solve a set of equations is: Equation A: y=15-2z and Equation B: 3y=3-4z so what would steps be?

Answer 1

You have to use substitution:

You already know what y is in terms of z so put it into the other equation

3(15-2z)=3 -4z
45-6z=3-4z
42=2z
21=z