Verified answer

From reading the data in the 60-minute and 120-minute rows of the table, we see that the equation of the line through (60, 83) and (120, 85) is needed.

Find the slope m of the line by computing (85 - 83)/(120 - 60).

Then use the point-slope formula G - G0 = m(t - t0), using either (60, 83) or (120, 85) for the point (t0, G0). In either case you should get the same equation for G in terms of t.

Finally, substitute both ordered pairs, (60, 83) and (120, 85), into the equation you selected to confirm that your answer is correct.

Have a blessed, wonderful day!

We need a linear function using (60, 83) and (120, 85)

G(60) = 83 and G(120) = 85.

The slope is (85-83) / (120-60) = 2/60 = 1/30

G(t) - 83 = (1/30) (t-60)

G(t) -83 = (1/30) t - 2

G(t) = (1/30) t - 2 + 83

G(t) = (1/30) t + 81.

Check it by verifying that G(120) = 85