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
The answer is 32.8 the unrounded number is 32.8260869... but you need to round to the tenth place so it is 32.8 it doesn't round up because you round down if it is less than 5.