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The average weight of a male child’s
brain is 970 grams at age 1 and 1270 grams at age 3.
(Source: American Neurological Association)
Assuming that the relationship between brain
weight y and age t is linear, write a linear model for
the data.
I think the point needed is (age, weight).
If so, our two points are (1, 970) & (3, 1270).
m = (1270 - 970)/(3 - 1)
m = 300/2
m = 150
Now use the point-slope formula.
y - 970 = 150(x - 1)
y - 970 = 150x - 150
y = 150x - 150 + 970
y = 150x + 820
Correct?
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