What is constant of proportionality?

Ariable y is directly proportional to the variable x. ... The constant is called the coefficient of proportionality or proportionality constant. If one variable .

The constant of proportionality (in math) is when you divide the dependent variable by the independent variable and the answer that you get has to be a number over 1 and that will be the constant of proportionality.

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!