Recall y=mx+b. slope is m.
In this case, y=7x+0.
I have slope 7.
Now, change opposite of sign and change numerator and denominator; meaning see 7 as 7/1. Now change numerator and denominator, you get 1/7. Therefore, you get NEW slope -1/7.
given point (-1, 9). so,using y-y1=m(x-x1) or, m=(y-y1)/(x-x1), you heard slope is rise/runs, to find equation of line. you come out with y-9=-1/7(x+1).
Now, test answer by plug in x=-1 and y=9
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