Rob is saving to buy a new MP3 player. For every $15 he earns babysitting, he saves $8. On Saturday, Rob earned $60 babysitting.
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When you write a function in the form , y is the dependent variable, and x is the independent variable.
So, if b is the independent variable, it means that we have to solve the expression for r.
To do so, we perform the following steps: start with
Add 12 to both sides
Divide both sides by 4:
So, we wrote the expression in the form , which means that r is the dependent variable and b is the independent variable, as requested.