exam Maths Puzzle Numerical Ability

Solve by the elimination method
2x+3y=2
4x+6y=4

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exam Other Question

How many gallons of an 80% alcohol solution must be mixed with 30 gallons of a 22% solution to obtain a solution that is 70% alcohol? If (3,-6) are coordinates of a point on the graph of y=f(x), give the coordinates of a point on the graph of y=f(x)-4.