how exactly do i graph the equation given to figure out if itsone to one? For ex

Question

how exactly do i graph the equation given to figure out if itsone to one? For example: f(x) = x-5 how exactly do i graph the equation given to figure out if itsone to one? For example: f(x) = x-5

Explanation / Answer

graph f(x) = x - 5       =>    y = x -5           this is in the form of     y = mx + b                                                                      slope m = 1 your first point is (0, -5)   => when x =0   then y = -5 you next point can be (5, 0) => when x = 5  then y = 0 you only need two points to make a line. Once you graph the line: using the horizontal line test wecan clearly see that it's one-to-one since we "cannot find anyhorizontal line that intersect the graph more than once"

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