Question

Let y = a + bx be the best-fit straight line for the data pairs (1, 1), (1, 2), (2, 0). Find b.

Answer 1

Solution Guiven ean of straight line is - y = at 63 Here, the slope is (m) = 6 Guven points are : (4,1),(2,1),(0,0) -- ñ 1+1+2 3 WlA Ý = 1+2+0 3 1 Now, slope (m) = (ki=) (78-8) 1 (22-712 3 * : -) (Yi-Y) 11 (24-8 I=1 ls - x)(%-Y) + (-3)(ya-ỹ)+(3-3)* -9) Q-X)* + (4-8 Jø + (-X)? 2- 5)(2-1) + (-3)(2+1)+(2- }) (0-1) 4- $) + (4- )' + (d- $) 3 - +

- 1 = 6/9 AN m - 1.5 11 &W Now, Since b m Therefore, b = -1.5

If any doubt please comment