Answer:
- y = 1.8x +53.7
- 73.5 in 2005
Explanation:
The 2-point form of the equation of a line is useful here. It tells you that for the points (x1, y1) and (x2, y2) the line can be written as ...
y = (y2 -y1)/(x2 -x1)(x -x1) + y1
For your given points, this is ...
y = (60.9 -57.3)/(4 -2)(x -2) +57.3
y = 1.8(x -2) +57.3
y = 1.8x +53.7 . . . . . simplify
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For x = 11 (in 2005), the predicted value is ...
y = 1.8·11 +53.7
y = 73.5