book Maths Puzzle Numerical Ability

How do you solve these linear inequalities algebraically?

3x+4y=5
Ax+3y=B

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book Other Question

A plane leaves Chicago headed for Los Angeles at 540 mph. One hour later, a second plane leaves Los Angeles headed for Chicage at 660 mph. If the air route from Chicago to Los Ange Simplify (3x^2y^3)(2x^3y)