Question 63942
1.true or false:
-3x-6y=-21
9x+6y=-9
___________ [Subtract the equations]
6x=-30
x=-5 [Substitute and solve for y]
.
 
-3(-5)-6y=-21
15-6y=-21
-6y=-21-15
-6y=-36
y=6
.
checking:
9(-5)+6(6)=-9
-45+36 =-9
-9=-9, so the answer is true, x=-5 and y=6 for both equations.