Approximately 9 out of 10 smokers began smoking before the age of 21. In a group of 400 smokers, about how many of them started
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Find two points by giving x an y values and solving the equation:
y = -4/7x +1
1 = -4/7x +1, x =0
First point is (0,1)
5 = -4/7x +1, x = -7
Second point is (-7,5)
Now plot those two points on the graph and draw a line through them
See attached picture:
