exam Maths Puzzle Numerical Ability

If y - x = -3 and 4x + y = 2, then what does x equal?

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exam Other Question

factor each trinomial. Factor out all common monomials first including -1 if the lead coefficient is negative if a trinomial is prime, so indicate
a^4-13a^2+36
please help me with this equation:

what is the square roots of 800, 216, 7 radical 27?