Answer:
(x,y)=(-1, -2)
Step-by-step explanation:
y = -3x-5
y = 9x+7
Multiply the first equation by 3:
3y = -9x-15
Now, we can solve the system of equations using the elimination method. In this case, we can eliminate x be adding the two equations:
y+3y = 9x-9x+7-15
4y = -8
Divide both sides by 4
y=-2
Plug -2 back in for y to solve for x:
y=-3x-5
-2=-3x-5
Add 5 to both sides
-2+5=-3x-5+5
3=-3x
Divide both sides by -3
x=-1
(x,y)=(-1, -2)
