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-x + 2y - 20
On its own this is just a mathematical expression involving two unknowns (x and y).
Make it equal to a value (say zero) and it becomes an equation.
-x + 2y - 20 = 0
After rearranging to make y the subject we have :-
2y = x + 20 . . . which we can amend to show a single y as the subject.
y = ½x + 10.
This represents the equation for a straight line that passes through the points (-20, 0) and (0, 10).
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