180p+10f=850 190p+20f=900

Solve by substitution of equations
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1 Answer

line 1: 180x +10y=850  or 360x +20y=1700

line 2:190x+20y=900

line1 -line2...(360x -190x) =(20y-20y) =1700-900

170x=800

x=800/170=4.7058823

from line1...y=-18x +85

y=-(18*800/170) +85=84.705882+85=169.70588
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