exam Maths Puzzle Numerical Ability

i have to solve the problems using system of equations..
1.x+y=6 2. 2x-3y=-13
y=2x y=2x+7

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exam Other Question

how would you solve {{{x^2+7/8x-x/8}}} and {{{a+a/5+2/5a}}} For a sample of size n = 100, proportion p = 0.6, and at a 95% confidence level, the upper bound of the portion is: