What multiplies to get -9 and adds to get 0

3 and -3 multiply for -9 and add for 0

3 and -3
3 x -3 = -9
3-3 = 0

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!