exam Maths Puzzle Numerical Ability

4/3r-3 < r-2/3-1/3r

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exam Other Question

Number problems. You have at least $30 in change in your drawer, consisting of
dimes and quarters. Write an inequality that shows the different number of coins
in your drawer.

Thank you :) I am having a hard time understanding constants. Here is my problem: Determine the constant k so that the graph of 3x+(k-1)y=k+1 will have slope 5.

Thank you.