Slope-intercept form is:
y = mx + b
"m" is the slope, "b" is the y-intercept (the y value when x = 0)
You need to find "m" and "b".
If you look at the graph, at x = 0, y is -1, so the y-intercept is -1.
y = mx - 1
To find the slope, you use the slope formula, and plug in the points (-1,2) and (1,-4):




m = -3
y = -3x - 1 The first choice is your answer