exam Maths Puzzle Numerical Ability

Solve system using the subsitution method"
x^2+3y=25
x+y=7

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exam Other Question

lucille recieves an annual salary of $37,500 based on a 37.5 hour workweek. What are her gross earnings for a two-week pay period in which she works 9 hours of overtime at 1.5 time (2sinxcosx + cosx - 2sinx - 1)/(-sin(squared)x) = (2 sinx + 1)/(cosx+1)
Please prove one side to equal the other (verify identity). Thank you.