exam Maths Puzzle Numerical Ability

Use elimination to solve each system of equations.

13a+5b=-11
13a+11b=7

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exam Other Question

The sum of two areas of two circles is 128(pie)ft^2. The difference of the circumferences is 8(pie)ft. Find the radius of each circle. I need help solving: 7(over)x^2-7x+10 minus 3(over)x-5.

I need help solving: a(over)a^2-3a x a^2-9(over)6a.