Use substitution to solve this system of the equations 2x-3y=-1 y=x-1

(x, y) = (4, 3)

Step-by-step explanation:

The second equation gives an expression for y that can be substituted into the first equation.

... 2x -3(x -1) = -1 . . . . put x-1 where y was

... -x +3 = -1  . . . . . . . simplify

... 4 = x . . . . . . . . . . . add x+1

Using that second equation, we can find y to be ...

... y = 4 -1 = 3

The solution is (x, y) = (4, 3).

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step-by-step explanation:

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.