Marc puts 28 liters of water into a tub and 6 liters of water into a bucket. Then, he pours both containers into a tank.
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parallel lines, have the same exact slope, hmmm what is the slope of y = -2/3 x + 1/3 anyway? well, low and behold, the equation is already in slope-intercept form, therefore
has a slope of -2/3.
so we're really looking for a line whose slope is -2/3 and runs through 9,4.