In y=mx±b of slope-intercept form, the b is the y-intercept either positive or negative.
y=4x+12, in this case, 12 is your y-intercept!!
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I hope that helps you out!!
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~Zoey
In 2 years theirs 17520 in total!
Spencer would be the correct one because it's easier to keep your variables positive when trying to solve. Therefore, in order to keep the variable positive, one would have to add 4x to both sides.