Question

Solve the system of linear equations below.

x - 3y = -3
x + 3y = 9

a) x = -12, y = 7
b) x = 3, y = 2
c) x = 6, y = 1
d) x = 6, y = 2

Answer 1

Add both equation together.
x - 3y + x + 3y = -3 +9
2x = 6
x = 3

Now substitute x = 3 in to any of the equations given
I will substitute it to the 2nd equation
x + 3y = 9
3 + 3y = 9
3y = 9-3
3y = 6
y = 2

Answer 2

thanks so much!