Question

What is the resulting equation when the expression for y in the second equation is substituted into the first equation?

3x + y = 1
y = 6 - 4x

Answer 1

Have you considered performing the substitution?

Answer 2

huh

Answer 3

Why do you have a "substitution" problem if you have no idea what substitution is?

Here is a sentence.

Three cats ate all the dog's food.

Now, if we happen to know the dog's name, Sproutzon, we can SUBSTITUTE and create the same sentence.

Three cats ate all Sproutzon's food.

See how that works? That is what you need to do with your equations.