exam Maths Puzzle Numerical Ability

Find the slope and the y-intercept

5 - 1/4 y= 4x

The slope is __
The y-intercept is (0,)

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exam Other Question

Ok I got the rest of the ones completed but i'm stuck on these three. please help

I am suppose to constuct truth tables and then determine how many cases are true for each state I really don't understand Greatest Percent Error and how to find Percent Increase/Decrease. I need to know this for a test tommrow so if you could help me it would mean a lot!!!!