Question 470006
{{{ graph( 200, 200, -100, 300, -100, 300, 0.05x+60, 0.15x+40) }}}
Solution is where they cross
y=.05x+60 multiply this one by -3 and add to second one
y=.15x+40
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-3y=-0.15x-180
y=.15x+40        add them
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-2y=-140 divide each side by -2
y=70 now plug this into one of the original equations
70=.05x+60 
10=.05x divide each side by .05
200=x
so the solution is (200,70)