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Solve the following system of equations by graphing. Check your answers before looking at the solutions.

Answer

(2, -1)

Example 2

Solve the following system of equations by graphing. Check your answers before looking at the solutions.

Answer

There are an infinite number of solutions, since the two lines are the same.

Example 3

Solve the following system of equations by graphing. Check your answers before looking at the solutions.

Answer

These equations give the same line, so every point on the line . We could also say that every point on the line 15x + 10y = 30 is a solution. In fact, we do say that.