The graph above shows the number of Georges unsold candy bars over a 10-day period. The points on the graph all lie on which of the following lines?

y = 10 x - 120

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y = 10 x + 120

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y = 12 x - 120

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y = 120 - 10 x

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y = 120 - 12 x

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Solution

The correct option is B $y = 120 - 12 x$
The generic equation for a line is y=mx+b where b is the y-intercept (when $x = 0$ , b is where it crosses the y-axis) so know that $y = m x + 120$ just solve for M by plugging in one of the values, for instance, you can see it intercepts the x-axis at $10$ where the y value is $0$ ..
plug those two in you get $0 =$ $10 m + 120$ solve for M and you get $- 12$ .
So the answer is $y = 120 - 12 x$

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