In Exercises 3-4, suppose that the augmented matrix for a lin- ear system has been reduced by row operations to the given row echelon form. Solve the system. 1 -3 4 7 | 3. (а) 1 2 1 5 8 -5 6. (b) 1 4 -9 3 1 1 1 7 -2 -8 -3 1 1 5 (c) 1 3 9. 0 0 1 -3 7 1 (d) 1 4 0 0 1 6

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A: Solution: The objective is to solve the given equation

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A: Confusion comes when you view f as a function, instead read the statement replacing f by "c"

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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.