The complete graph of y=f(x), which consists of five line segments, is shown in red below. (On this graph, the distance between grid lines is 1.)
What is the sum of the $x$-coordinates of all points where $f(x) = 1.8$?
Draw a line at y = 1.8
it crosses the graph at 3 points.... read down below those points to get the 'x' values to add together
first one x = .9
second one x = .....
third one x = .......
maybe im dumb or smth but how do i find those 3 values? I don't know how to graph them