book Maths Puzzle Numerical Ability

Solve.
x^2=y^2=25
y-x=1

Thanks!

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book Other Question

complete the square, and find the roots of the quadratic equation.

x^2 + 16x = 0 If you travel only 35 miles per hour, is 2.5 hours enough time to get to a concert that is 85 miles away? Give an expressionto find answer...