book Maths Puzzle Numerical Ability

Find the equation of each line. Write each answer in slope-intercept form.

Example

The line with slope -8 that goes through (-1, -5)

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book Other Question

The length of a rectangle is decreased by three feet, and the width is increased by one foot, forming a square region having an area of 25 square feet. What is the area of th original rectangular region? I dont understand

1.10^t = 1.4641 (1.10to the power of t (^=power of))