book Maths Puzzle Numerical Ability

Write the slope-intercept form of the equation of the line passing through the
point (-2,3) and paralley to the line y=-5x-4.

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Problem is I=PRT and I need to solve for "r" can anyone help me in describing how I do this? Let f= 1 2 3 4 5
2 3 1 5 4

and

g= 1 2 3 4 5
3 4 2 5 1.

What is f inverse -1?
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