exam Maths Puzzle Numerical Ability

Solve the system by addition or substitution.
10x-5y=17
y=2x-3

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exam Other Question

Solve for x:

A.) Log(base 3)4 + log(base 3)5 = log(base 3)(4x+5)

B.)log(base 7)6 -log(base 7)(x-1) = log(base 7)3

C.)3log(base x)4 = 2
-x<_91