uzmanasuhaow3y0p
uzmanasuhaow3y0p
11-09-2017
Mathematics
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x-y=40 and 80x+45y=2640
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ShayanSh
ShayanSh
11-09-2017
-80(x-y=40) = -80x+80y= -2400
***
80x+45y= 2640
+(-80x+80y= -2400)
= 125y = 240 =>
[y=240/125=1.92]
=> x -1.92 = 40 => [x = 41.92]
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