Question 142781
0.3x-0.2y=4
0.4x+0.5y=-55/17
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3x-2y=40
4x+5y= -550/17
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15x-10y=200
8x+10y=-1100/17 now add these 2 equations.
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23x=200-1100/17
23x=(200*17-1100)/17
23x=(3400-1100)/17
23x=2300/17
x=(2300/17)(1/23)
x=100/17 answer.
.3*100/17-.2y=4
30/17-.2y=4
-.2y=4-30/17
-.2y=(4*17-30)/17
-.2y=(68-30)/17
-.2y=38/17
y=(38/17)(1/-.2)
y=38/-3.4
y=-19/1.7
y=-190/17