exam Maths Puzzle Numerical Ability

Solve each system by the addition method. Determine whether the questions are independent, dependent, or inconsistent.

3x-4y=9
-3x+4y=12

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exam Other Question

Can you please walk me through the solution.... I have seen examples, but I missed class for 2 days & I am very lost at this point.

1.) y/4=5/6
2.) 6m/5=-6 Find all the solutions of the equation algebraically.

9x^4-24x^3+16x^2=0