Answer:
Given system of equations:

To solve by substitution, equate the equations and solve for x:

Therefore, the x-values of the solution are
and
.
To find the y-values of the solution, substitute the found values of x into the functions:




Therefore, the solutions to the given system of equations are:
and 
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Answer:
300 squared feet.
Step-by-step explanation:
Area of a rectangle = length × breadth = 20 × 15 = 300 squared feet.