y The equation -21=-15 is solved in several steps below. 2 For each step, choose the reason that best justifies it. Step Reason y - 21 =-15 2 Given equation y -21+21 =-15+21 2 Choose one y Choose one =6•2 2 Choose one y = 12 Choose one 2-

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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.