y = mx + b
"m" is the slope, "b" is the y-intercept [the y value when x = 0, so (0,#)]
You can find the slope by using the slope formula and plugging in 2 points:
[tex]m =\frac{y_{2}-y_{1}}{x_{2}-x_{1}}[/tex]
Or you can use this:
[tex]slope=\frac{rise}{run}[/tex]
Rise is the number of units you go up(+) or down(-)
Run is the number of units you go to the right.
If you look at the graph, from each point you go down 2 units, and to the right 1 unit, So you slope is -2/1 or -2. When x = 0, the y value is 2, so your y-intercept is 2.
y = -2x + 2 The first choice is your answer
