Question

Emily and Andy each go to a hardware store to buy wire. The table shows the cost y in dollars for x inches of the wire they need. Emily needs 23 feet of the wire. Andy needs 15 yards of the wire. How much will each of them spend for​ wire?

Answer 1

There is no table to look at.

Anyways, to solve for the amount they will spend you will have to do some conversions to switch yards and feet to inches. Additonally, there is also a rate missing which is the cost per inch.

So here is what you’ll have to do…

1. Solve for the slope of the equation

2. See if this linear equation has a y-intercept. It can be done by looking at the table to see where x=0 or by solving using y=mx+b where you substitite the slope for “m” and any coordinate that lies on the graph for “y” and “x” to then solve for “b” which is the y-int.

3. Then write out your equation.

4. Make the conversions

5. Solve for the cost by subtituting the units of measurement into the “x”.