exam Maths Puzzle Numerical Ability

Please help me with these equations: X+2y=5, 3x-y=1, 3x+y+4, x+3y=-4 thank you so much..

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exam Other Question

Tow cars leave town at the same time going in the same direction. One travels 55 mpb and the other travels 48mph. In how many hours will they be 49 miles apart? Hi could you help me with this question on rational expressions?

Simplify each rational expression. State any restrictions on the variable.
3x^2-12/x^2-x-6

Thanks for the help!