# algebra

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your local rollerblade rink will rent you blades for \$14.00 for 3 hours or \$29.00 for 8 hours. Asume the price increase is constant depending on the number of hours the blades are rented.

Find the expression

• algebra -

x = hours
y = price
two points (3,14) and (8,29)
y = m x + b

m = (29-14)/(8-3) = 15/5 = 5

y = 5 x + b
14 = 5(3) + b
b = -1
so
y = 5 x - 1

• algebra -

hey damon..thank you for your answer but would 15/5=3...so where would the 3 go...thank you

• algebra -

whoops, sorry
m = (29-14)/(8-3) = 15/5 = 3

y = 3 x + b
14 = 3(3) + b
b = 5
so
y = 3 x +5

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