Solve x+y=3 by substitution if possible
x+2y=6

(0,3)

Step-by-step explanation:

We want to solve the system of equations:

To solve by substitution, we make one variable the subject in one equation and substitute into the other equation.

Let us make y the subject in the first equation to obtain:

We put this into the second equation to get:

Simplify:

Put x=0 into y=3-x

The solution is x=0, y=3

c.

step-by-step explanation:

because first you have to add the 4x, 9x, and the 7x together and you get 20x and then you add the last numbers up and you get 5and then you put the subtraction sign in there and that's how you get the answer.