Bob
]]>that's, True. Suppose we start at x = x1 and increase x by 1 unit to x1 + 1. If y = b + mx, the corresponding values of y are b + mx1 and b + m(x1 + 1). Thus y increases by
∆y = b + m(x1 + 1)−(b + mx1) = m.
why I find this hard to understand?
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