Question

X| 25 | 35 | 45 | 55 |

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Y| 102 | 100 | 98 | 96 |


Can you help find the y-intercept please?

Answer 1

A graphing calculator can do a linear regression on these points very easily. The y-intercept is 107.

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If you want to do this by hand, you can use the 2-point form of the equation for a line, then evaluate for x=0.
.. y = (100 -102)/(35 -25)*(x -25) +102
.. y =-2/10*(0 -25) +102
.. y = 107