exam Maths Puzzle Numerical Ability

If 2x - 3y = 0 and 3x + 2y = 13, find x + y. Do I solve for x and y and then just add them. Please show me.

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exam Other Question

find the domain for y = log2 (x+3) and graph the function. show the asymptote and write it's equation. One solution contains 10% alcohol while another contains 30% alcohol. How many liters of each should be mixed to give 10 L of a solution which is 25% alcohol?