The value of B is -9 hope this helped
b=-9
Step-by-step explanation:
Given that line MN passes through two points (4,3) (7,12)
Let us assume that equation of the line be y =mx+b in slope intercept form
Since it passes through (4,3) substitute in the equation to get
... i
Similarly since the line passes through (7,12)
ii-i gives
9 =3m or m =3
Substitute in i
4x^2-4x-3=0
factor
(2x+1) (2x-3)=0
2x+1=0 2x-3=0
2x=-1 2x=3
x=-1/2 x=3/2
x=-1/2, 3/2