exam Maths Puzzle Numerical Ability

f(x)=5x-1

f(x-h)-f(x)
___________
h

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exam Other Question

Solve by the substitution method.

4x+7y = 35

-3x+y = 30
Can someone please help me with this. if secA=5/4,verify that 3sinA-4sin3A/4cos3A-3cosA