exam Maths Puzzle Numerical Ability

Find the slope of the graphed lines of 0 ,1, -2 and undefined. HUH? I dont get it.

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exam Other Question

Laura invested $2000, some at 8%,annual simple interestand the rest at 10% annual simple interest, giving her a total of $176 per year. How much did she invest at 8%? 6x+2 for x=3