exam Maths Puzzle Numerical Ability

Find an equation of the line that has the same y-intercept as the line x - 3y = 6 and contains the point (5,-1).

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exam Other Question

f(x)=7
what is f(2)? Just taking algebra again after 21 years. Have a simple question. How do I solve (3/5)^-2? Do I multiply 3/5 twice and it is positive because of the two negatives? That answer would be 9/25??