The chart below gives price and fuel efficiency for Ford Escape SUVs with conventional or hybrid engines. Car model  price average mileage  (mpg) Ford Escape (conventianal)  $25,000 24 For escape (Hybrid)  $33,500 38 What is the annual cost to drive the conventional Ford Escape for 15,000 miles if gas costs $2.50 per gallon?   What is the annual cost to drive the hybrid model Ford Escape for 15,000 miles if gas costs $2.50 per gallon?   How much money would you save annually if you bought the hybrid model instead of the conventional Ford Escape, assuming you drove 15,000 miles each year?   How many years of driving the more fuel-efficient SUV would it take for you to make up difference in its higher sticker price over the price of the conventional model?

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Equations and Inequations

Equations and inequalities describe the relationship between two mathematical expressions.

Linear Functions

A linear function can just be a constant, or it can be the constant multiplied with the variable like x or y. If the variables are of the form, x2, x1/2 or y2 it is not linear. The exponent over the variables should always be 1.