math

Greg teaches martial arts. He charges a one time processing fee of \$5.00 and the cost of classes are shown below. let x represent the number of classes and y represent the cost of the classes. Based on the information, what will it cost to take 10 classes?
(x) classes 1 2 3 4
(y)cost of \$15 \$27 \$39 \$51
classes:

so I was able to figure out the cost goes up by \$12 for each class.
that will give me \$123 for 10 classes and then I have to add the \$5 processing fee- giving me \$128 as my answer.
Is this correct? Is there a different way of solving this using x and y?

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1. If it's \$12/class then 10 classes would cost 10*12 = \$120 and that + a \$5.00 processing fee would make \$125 wouldn't it?

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2. It isn't \$12 a class but from the numbers they give, for example one class =\$15, two classes =\$27, three classes=\$39, and four classes=\$51
so the difference between each class is \$12; not each class costs \$12.
so to figure out 5 classes I added \$12 to \$51 dollars, getting\$63; then I added \$12 to that to get\$75 dollars for 6 classes and so on until I got to 10 classes and it =\$123 plus \$5 fee.
Do you see how I did my work

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3. OK. So it's 15 + 12*9 + 5 = 15 + 108 + 5 which is 128 as you had.

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4. ok, Thank you

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