Question 979009

y, Lucas
x, his son


{{{system(y=9+3x,y+14=6+2(x+14))}}}


{{{system(y=3x+9,y=-14+6+2x+28)}}}


{{{system(y=3x+9,y=2x+20)}}},  two formulas for y in terms of x...


{{{3x+9=2x+20}}}


{{{x=20-9}}}


{{{highlight(x=11)}}}.  The son
Use this to evaluate y.


{{{y=9+3x}}}

{{{y=9+3*11}}}

{{{highlight(y=42)}}}, Lucas