Question 996161
{{{y=mx+b}}}


{{{m=3.5(cm/week)}}}

Now, {{{b=10*cm}}}

{{{y=3.5x+10}}}


Want x for y=27.5.


{{{mx=y-b}}}
{{{x=(y-b)/m}}}
{{{x=(27.5-10)/3.5}}}