What happens when you subtract a positive number from a negative number?

When you see minus sign and a negative sign together, it turns the two signs into a plus sign. Example:

5-(-2)
=5+2
=7

The correct answer is -20y

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!