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imc

algebra intermediate

Problem

How many ordered pairs of real numbers satisfy the following system of equations?
(A)
(B)
(C)
(D)
Solution
The second equation is . We know that the graph of is a very simple diamond shape, so let's see if we can reduce this equation to that form: We now have two separate graphs for this equation and one graph for the first equation, so let's put it on the coordinate plane: We see from the graph that there are intersections, so the answer is .
Final answer
D