Write an equation in point-slope form
Amount charged=$2.50
miles unknown
$2.50 fee
point-slope formula = y-y1=m(x-x1)
The equation in point-slope form can be written as:
Amount charged = $2.50 + (miles unknown) * $2.50
or
y = $2.50 + ($2.50)(x - x1)
where
y is the amount charged,
x is the number of miles,
$2.50 is the fee,
m is the cost per mile above the fee, and
x1 is the x-coordinate of a point on the line.