ordered pair (7,4) is a solution to which system of equations?

Answer 1

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Uh, you didn't provide the system of equations, but I can give you the concepts. A system of equations just means you have 2 lines or 2 graphs. The solution is the intersection of those 2 lines, the solution is a point on each line/graph, and the solution must make each equation hold true or satisfy each equation. To determine whether an ordered pair (x,y) is the solution, simply plug in x=7 and y=4 into each equation of the system of equations and see if each equation holds true.

Answer 2

the third one