exam Maths Puzzle Numerical Ability

Could you please help me with a question?

Solve the system:
2x + 3y = 12
x + 1.5y = -1

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exam Other Question

two investments were made totaling $15,000. For a certain year these investments yielded $1432 in simple intrest. part of the $15,000 was invested at 9% and part at 10%. find the amount invested at each rate Ok so I have to right a proof solving this problem: "If you are given a trapezoid with congruent base angles, how would you prove that the trapezoid is iscoceles". I have to solve