Question

Solve this system of linear equations. separate the x- and y- values with a coma. -2x=8-6y

-15x=21-6y

Answer 1

The y variable has the same coefficient so use elimination (subtract equations).

-2x = 8 - 6y
-(-15x = 21 - 6y)
------------------------
13x = -13 + 0

x = -1
Use this to find y in either equation.
-2(-1) = 8 - 6y
2 = 8 - 6y
2 - 8 = -6y
-6 = -6y
y = 1

(x,y) = (-1, 1)