Question

Solve by substitution;
4x-12y=5
-x+3y

Answer 1

You have no equal sign on the second line ---> typo

Answer 2

Your second line is not a complete equation.

-x + 3y = ???

Unless you provide a complete pair of equations, there is no solution.

Your second equation, when complete, will tell you what to substitute for x in the first equation.