exam Maths Puzzle Numerical Ability

Solve the system by addition.
4x + 6y = 9
8x - 3y = -7

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exam Other Question

Solve and Graph the inequality. Write the solution set in interval notation:
10x-17>9(x-2)-13
Can anyone help....Thank-you guys prove or disprove without a calculator.

1. sin(pi/2 + theta) = cos theta