exam Maths Puzzle Numerical Ability

Solve the system by substitution.

3x - y = -7
x + y = -9

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exam Other Question

One number is 100 larger than another number. If the larger number is divided by the smaller number, the quotient is 15 and the remainder is 2. Find the numbers I need help solving this equation:

5x^3+20x^2+15x=0