SECTION 7.7 SECTION EXERCISES For the following exercises, solve the system using the inverse of a 2 x 2 matrix. 27. 5x-6y =-61 4x+3y 2 28. 8x + 4y-:-100 3x -4y 1 29. 3x-2y = 6 30. 5x-4y -5 4x+y- 2.3 -x + 5y =-2 31. -3x - 4y 9 2 5 12x + 4y =-6 For the following exercises, solve a system using the inverse of a 3 x 3 matrix 38. 6x- 5y+2z-4 12

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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.