slope: Ann is building a wheelchair ramp with a 7% incline

[davidW]

Ann is building a wheelchair ramp with a 7% incline from her entryway into her sunken living room. The height of the ramp needs to be 21 cm. What will be the length of the ramp.

Do I use the slope-intercept concept? y=mx+b
Or do I need to graph this problem out?


David

 

[skeeter]

a 7% incline means the ramp will be slanted with 7 units of rise per 100 units of run.

you were given info that the ramp had to rise 21 cm ...

what will be the ramp's length (run)?