Answer quickly: in the following equation, a, b, and c are constants and y is the variable. solve the equation for y. show each ! aby-b=c

Start by adding b to both sides:

Divide both sides by ab:

This means that we must impose that which means that neither a nor b can be zero.

Answer

The distance from the house to the lake is (2.5 hr)*(48 mi/hr) = 120 miles. The rerurn trip would take (120 mi)/(40 mi/hr) = 3 hours. Distance equals rate times time, so the distance to the lake is 2 1/2 hours times 48 miles per hour.

I hope this helps