Math
Solve for both systems: 5y+2x=12 and 4y + 7x = 15
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Asked by
AnneS2
Last updated by
anonymous
5y+2x=12
5y-5y+2x=12-5y
2x=12-5y
2x/2=12-5y/2
x=6-2.5y
4y + 7x = 15
4y + 7(6-2.5y) = 15
4y + 7(6) (7)(-2.5y) = 15
4y + 42 -17.5y= 15
42 -13.5y= 15
42 -13.5y-42= 15-42
-13.5y=-27
-13.5y/-13.5=-27/-13.5
y=2
x=6-2.5y
x=6-2.5(2)
x=6-5=1