3. Find a solution to the following system of equations.

-3x + 3y = - 9

-3x + y = 7

x = 5

y = 2

Step-by-step explanation:

-3x + 3y = - 9

3y = 3x - 9

Equation 1. y = x - 3

-3x + y = 7

Equation 2. y = 3x + 7

So, put number 1 equation to number 2's y:

x - 3 = 3x + 7

x - 3x = 7 + 3

-2x = 10

2x = 10

x = 10/2

x = 5

And, put x, which is 5, to the any equation to figure out the y.

This time, I'll use equation number 1.

y = 5 - 3

y = 2