book Maths Puzzle Numerical Ability

Jill has $3.50 in nickels and dimes. If she has 50 coins, how many of each type of coin does she have?

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book Other Question

Now this is a challenge for me. the question reads, write an equation in slope-intercept form of the line that passes through a given point and is perpendicular to the graph of each equation. problem #33 is (6, -13), 2x - 9y = 5 how would you graph |x+1|=y? what does the | | mean?