Step-by-step explanation:
eqn of line : y = mx+ c
m = slope or gradient
c = y-intercept.
Lets take (1,6) = (x1,y1) and (2,3) = (x2,y2)

Substitute x = 1 and y = 6 into equation,

Therefore substituting m and c value, equation of line is

Answer:
1. b
2. a
3. d
4. c
Step-by-step explanation:
72/8 +3*4 - 105 /5
= 9 + 12 - 21
= 21 -21
= 0