In 21-28, determine whether the given function is linear or nonlinear. If it is linear, determine the slope. x y = f (x) 26. x y = f (x)-2 -26 -1 -4 0 2 -2 2 - 10

Section 1.1 Introduction Linear Equation General form is ax +a+++=ax a.x b 11 2 2 33 nn where the a's ari constant, x's aie variables and b is a constant. In short, a linear equation contains • no products of variables, • no functions of variables and • no powers of variables (other than the first power) Examples: Is the equation Linear or Nonlinear 3sin x+2= 5 (A) 236x−=+ (B) 1 2 1 2 π 0 3n (C) i=++2s()2 x1 4 xx += 30 (D) 12 2 π 1 (E)os x1 2 3xx 3 34 3x4+z=− π 2 (F) A System of Linear Equations contains one o