Question

How can I solve
x + 3y=12
5x+ y =4

by substitution?

Answer 1

First you get a variable by it's self in this case you I think it would be easier making the y by it's self by subtracting -5x to both sides leaving you with
y = 4-5x so then you "substitute" or in other words plug back in the equation
to the first equation

1x + 3(4-5x) = 12 can you go from here? :)