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If slope = -2 for a line on a graph with x on the horizontal axis...

If slope = -2 for a line on a graph with x on the horizontal axis and y on the vertical axis, then if

y increases by 4, x increases by 8
x increases by 4, y increases by 8
x increases by 4, y decreases by 8
x increases by 4, y increases by 2
x = 4, y = 8
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