exam Maths Puzzle Numerical Ability

Please help me figure out the range of the relation {(-2,-3),(1,0),(5,-2)}

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exam Other Question

Suppose x and y satisfy both of follwing equations below. Then y = ?
x-3y=7 and 2x+4y=5

Thanks. For the following funtion, C computes the cost in millions of dollars of implementing a city recycling project when x percent of the citizens participate.

This is a fraction.