exam Maths Puzzle Numerical Ability

I need help in parellel perpendicular line by useing equations.

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exam Other Question

In a box, there are 25 coins consisting of quarters, dimes and nickels with a total amount of $2.75. If the nickels were dimes, the dimes were quarters and the quarters were nickels, the total amount would be $3.75. How many quarters are there? Write the following equation in the form of ax+ (or) - by= + (or) - c and the point slope form

slope undefined passing through (1,6)