exam Maths Puzzle Numerical Ability

Solve the following systems by substitution. Example 2 (p 712) and Example 4 (p 713) are the key models to go by for solving these exercises….

16) 5x - 2y = -5
y - 5x = 3

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exam Other Question

Given f(x)= {2x-1 x<3
{-2 x>or=to3

Evaluate f(-1)
Evaluate f(3)
Evaluate f(5)

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Hi I need someones help, I am supposed to evaluate ^-3sqrt of 64 if possible. I tried to do just that, but I keep coming up with the problem itself. I am not getting anything diffe