Question 693470
y =  cost
x = # of tickts
...
(1, 19.5) and (4, 78)
slope is {{{(78-19.5)/(4-1) = 58.5/3 = highlight_green(19.5)}}}
...
{{{highlight(y = 19.5x)}}} is the equation
CHECK:  if x = 4, y is 78
compared to y=mx+b, the slope, m is 19.5 and y intercept, b, is 0.
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