Question 260698
we have 2 coordinates here: (30, 620) and (70, 788). We can find the slope using
{{{m = (y2-y1)/(x2-x1)}}}
which becomes
{{{m = (788-620)/(70-30)}}}
and then
{{{m = 168/40}}}
or
{{{m= 4.2}}}
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Now, we use our slope and a coordinate to create the equation using
{{{y = mx + b}}}.
we get
{{{620 = 4.2*30 = b}}}
and then
{{{620 = 126 + b}}}
finally
{{{b = 494}}}
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now our answer as
{{{y = 4.2x + 494}}}
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If you take a 55 hour course, you should get
{{{y = 4.2*55 + 494}}}
or
{{{y = 725}}}