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Use the Properties of Equality.
See solution.
When we have an equation, it does not matter if we know the value of a variable or not. We can use the Properties of Equality to rearrange the equation any which way we need and isolate any variable we would like to have isolated. This can help us greatly in real life applications of various formulas.
We have been tasked with creating a triangular shaped garden for your friend's father's uncle's purple backyard. He has 20 square feet of sod and the area of the garden will, therefore, be 20 square feet. He wants one side lined up with his 5 feet of patio and the other side of the right triangle will be running along the edge of the yard. We have the following basic sketch of the garden.