Question

What is the solution to this system of equations?

-3x - 3y = 3

y= 7x +15

Please write your answer as an ordered pair.

Answer 1

-3x - 3y = 3

y= 7x +15

replace y= 7x +15 into -3x - 3y = 3
-3x - 3(7x+15) = 3
-3x -21x - 45 = 3
-24x = 48
x = 48/-24
x = -2

y= 7x +15
y= 7(-2) +15
y = -14 + 15
y = 1

solution (-2,1)