exam Maths Puzzle Numerical Ability

pls solve

(2a^-3a+5)-(-3a^+8a-4)

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exam Other Question

Solve the system of equations by graphing. Then classify the system as consistent or inconsistent and the equations as dependent or independent.

3x-y=6
3x+4y=-9

I am so lost on how do this problem, please help! How do you explain how to do this problem and solve, thanks.
4 In x + 7 In y - 3 In z