Given the table for a linear function f(x)={(-2,-1),(-1,1),(0,3),(1,5)} Need to find g(x)=-f(x)-2
First step is to find f(x) in analytical form. The slope-intercept form would be convenient because we can find both the slope and y-intercept. In a typical linear function f(x)=mx+c m= slope, can be found by (y2-y1)/(x2-x1) c= y-intercept [value of y when x=0]
So here, taking points (0,3),(1,5) m=(5-3)/(1-0)=2 c=3 [y-value when x=0] => f(x)=2x+3 => g(x) =-f(x)-2 [given] =-(2x+3)-2 [don't forget the parentheses] =-2x-3-2 =-2x-5