To solve this system of equations by elimination, we can first add the two equations together to eliminate the x variable:
(7x + 3y) + (-7x + 9y) = -25 + (-47)
3y + 9y = -25 - 47
12y = -72
y = -72/12
y = -6
Now that we have solved for y, we can substitute this value back into either of the original equations to solve for x. Let's use the first equation:
7x + 3(-6) = -25
7x - 18 = -25
7x = -7
x = -7/7
x = -1
Therefore, the solution to the system of equations is x = -1, y = -6.
Solve the system of equations by equations
7x+3y=-25
-7x+9y=-47
1 answer