Plzz almost done

use the substitution method to solve the system of equations.

2x+3y=12
y=x-1

Step-by-step explanation:

You con solve the system of equation with the Substitution method, as following:

- Substitute the second equation into the first equation.

- Solve for x:

- Substitute the value of x obtained above into the second equation to find the value of the variable y.  Therefore, you obtain:

-6 is the correct option from the above given options

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.