exam Maths Puzzle Numerical Ability

Could someone help me on this problem?

I need to rewrite the equation 4x- 10y = 11 as a function of x.

Thank you,
Sher

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exam Other Question

Solve the equation: 1n x = 1n 2 + 1n(3x-1)
I know the answer is 2/5 from the answers page.
I need to know how the solution was solved.
Thank you. Retangular shape:
240 m perimeter
length= triple the width.
Find: length and width

tried 3(x+x)=240

No go!