Four hours after leaving home, Joe is 200 miles from his destination. One hour later, he is 150 miles from his destination. Assume his speed is constant. Let x be the time (in hours) since Joe left home. Let y be Joe’s distance (in miles) to his destination. Write an equation expressing the relationship between the variables.   y=

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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.