Line mn passes through points m(4,3)and n(7,12).if the equation of the line is written in slope-intercept form, y=mx+b, what is the value of b?

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

hello from mrbilldoesmath!

answer:

25x^2 + 90x + 84

discussion:

mn(x) = m(n(x)) = m( 5x + 9) =

(5x + 9)^2 + 3 =>

25x^2 + 90x + 9^2 + 3 =

25x^2 + 90x + 84                 (as 9^2 = 9*9 = 81)

which is the second choice

regards,  

mrb

p.s.   i'll be on vacation from friday, dec 22 to jan 2, 2019. have a great new year!