Apack of gum costs 75cents. that is 3cents less than three times what the pack cost 20 years ago . which equation could be used to find the cost of the gum 20 years ago

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!