Answer: 6 x 8=48
Step-by-step explanation:
Answer:
78=c-13
c=65
____________________
13 65 78
x=-1, y=-3. (-1, -3).
x+y=-4
3x-6y=15
---------------
x=-4-y
3(-4-y)-6y=15
-12-3y-6y=15
-12-9y=15
9y=-12-15
9y=-27
y=-27/9
y=-3
x+(-3)=-4
x-3=-4
x=-4+3
x=-1
They washed 56 cars because 672/12=56
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