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Find a slope for a pair of given points. (a,b) and (c,d). Do I write it as d-b/c-a? I'm confused

Given the equation y=2x-3, if x increases by 1 unit what is the corresponding change in y? And if x decreases by 2 units, what is the corresponding change in y? Would these be written as 2(x+1)-3 and 2(x-2)-3?

I am studying for a quiz on Monday. If a word problem for the breakeven point says "each pump sells for $9"or "each unit sells for $14 each", then the key words "sell for" signifies the revenue?

When they mean change in y are they talking about the y variable. Would it be the change that would take place if the units are increasing or decreasing by a certain number of units?

*When they mean change in y are they talking about the y variable?