exam Maths Puzzle Numerical Ability

Please help, i dont understand this!
Are the following lines parallel, perpendicular, or neither?
L1 with equation x - 6y = 24
L2 with equation 6x + y = 6

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exam Other Question
f. What is the profit made from selling 20 tile sets per month?


g. What is the profit made from selling 25 tile sets each month?



h. What is the profit made from selling no tile sets each month? Interpret your answer.
 Please help me. I really need the answer.
The length of the longer side of a rectangle is 7 more feet than the length of the shorter side. Find the length of the shorter side that will generate an area of at least 18 ft.