To solve the system using elimination, subtract the second equation from the first equation to eliminate the variable x:
(3x + 3y) - (3x - 3y) = -9 - 21
3x + 3y - 3x + 3y = -30
6y = -30
y = -5
Substitute this value of y back into one of the original equations, let's use the first equation:
3x + 3(-5) = -9
3x - 15 = -9
3x = 6
x = 2
Therefore, the solution to the system of equations is (2, -5).
Solve the system using elimination.
3x + 3y = –9
3x – 3y = 21
(–5, 2)
(3, 3)
(3, –6)
(2, –5)
1 answer