Note that f(x) is a line in slope-intercept form, where a is the slope and b is the intercept.

Once you recognize that, you just need to know that, notationally, the –2 in front of f(x) means you multiply the whole thing by –2. So:

image

That’s still a line, but now the slope is –2a.

from Tumblr https://ift.tt/2LdY2wy

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