Is the following relation a function?

X Y

6 - 1

-1 2

4 3

0 3

Yes or no

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Jonah goes to the store to buy three notebooks and four pencils. his total is $8.50. if the cost of one notebook is ten times the cost of one pencil, write and solve an algebraic equation to determine the cost of one notebook and pencil.

Simplify the fraction 45xy/15x^2 to lowest terms.

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How do I find if the graph is a function in pre-algebra

Find the solution to the system of equations. -2x+2y=-4 3x+3y=-18

What is the area of 10 3/4 • 12 1/2?

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If cosx = sin20, find the value of x, 0 Solve for x correct to the nearest minute given sin^2 x-3sin xcosx+2cos^2 x=0, where 0≤x≤180