exam Maths Puzzle Numerical Ability

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

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exam Other Question

tom earned $6.25 per hour at his summer job. This was then $.85 less than joannas hourly pay. how much did johanna earn per hour Please help me figure out the range of the relation {(-2,-3),(1,0),(5,-2)}