solve the equation using substitution
y = 3x + 7
y= -4x
Since both expressions are equal to y, we can set them equal to each other and solve for x:
3x + 7 = -4x
Adding 4x to both sides:
7x + 7 = 0
Subtracting 7 from both sides:
7x = -7
Dividing by 7:
x = -1
Now that we have x, we can substitute it back into either equation to solve for y. Let's substitute it into the second equation:
y = -4(-1)
y = 4
Therefore, the solution to the system of equations is x = -1 and y = 4.