exam Maths Puzzle Numerical Ability

I have to eliminate using multiplication. How would I solve these two problems?

2x+3y=6
x+2y=5

4x+5y=6
6x-7y=-20

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exam Other Question

The ratio of the measures of the length and width of a rectangle is 5:7. The area of the rectangle is 1,715 square feet. Find the dimensions. Simplify the expression. Write answer with positive exponents. Assume that all variabls reperesent positive real numbers. -25^-2/3