What is the equation for this line ?

(-2,7)(0,-1)
slope = (-1 - 7) / (0 - (-2) = -8/2 = -4

y = mx + b
slope(m) = -4
use either ofur points (0,-1)...x = 0 and y = -1
now we sub and find b, the y int
-1 = -4(0) + b
-1 = b

so ur equation is : y = -4x - 1 or if u need it in standard form, it is 
4x + y = -1

Abit confused about what you mean, but i think you might be referring to slope intercept form: y = mx + bin that case b, or the y intercept is already given.(0,-1)find the slope by using the formulay2 - y1/x2 - x1the final slope will be 4/2, equivalent to 2.now your equation should look like thisy = 4/2x -1sorry if this didn’t you out!