exam Maths Puzzle Numerical Ability

Please help me in this problem. I need to find the value of x and y by using substitution or elimination. Thank you

{y=x
{x-4y=0

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exam Other Question

Solve 3/5b +1 = 1/2b +0.4 In a recent survey, 66% of the community favored building a police substation in their neighborhood. If 14 citizens are chosen, find the probability that exactly 11 of them favor the building of the police substation.