Question

The cost of metal is proportional to the weight of the metal. Rita bought 1.6 pounds of metal for $4.00. Let p represent the number of pounds of metal and c represent the cost in dollars. Which equation can be used to determine the cost of pounds of metal?

a. c = 2.4p

b. c = 2.5p

c = 4.0p

c= 6.4p

Answer 1

B

Explanation:

A proportional relationship has the equation y = mx where m is the unit rate. The cost per pound is 4.00 / 1.6 = $2.50 per pound.

So for every pound bought it'll cost $2.50 or 2.5p.

So the costs c = 2.5p.

This follows the form y = mx.