exam Maths Puzzle Numerical Ability

Please help.Solve each of the systems by substitution
5x-2y = -5
y - 5x = 3
Thank you.

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exam Other Question

solve for x:

(6-x)/3 + x/-5 = -7 If Ben invests $4000 at 4% interest per year, how much additional money must he invest at 5 1/2% annual interest to ensure that the interest he recieves each year is 4 1/2% of the total amount invested?