exam Maths Puzzle Numerical Ability

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!!!!

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exam Other Question

Find the slope and the y-intercept

5 - 1/4 y= 4x

The slope is ____
The y-intercept is (0,__) Suppose you have 12 coins that total 32 cents. Some of the coins are nickels and the rest are pennies. How many of each coin do you have?