exam Maths Puzzle Numerical Ability

The line is perpendicular to the line whose equation is 4x - y = 6 and has the same y-intercept as this line.

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exam Other Question

-4(2x-3) = -8x+5

solve and check result
Please help me with this problem:
the question is as followed:
If you borrow money, you have to pay interest on the money you borrowed. The formula used to find the interest is