math questions

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1- Write an equation for computing a tip in a restaurant. Does your equation represent a function? If so, what are your choices for the independent and dependent variables? If not, select none in the appropriate blanks.

Find where is a meal price, is a tip.

2-Write a formula to express the following sentence as an equation: The sale price is off the original price. Use for sale price and for original price to express as a function of

I need it asap