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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?

 Aug 8, 2020
 #1
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0

Slope =   -9/-3 = 3

   y = 3x + b    sub in one of  the given points to calc b

   3 = 3(4) + b     b = -9

 Aug 8, 2020
 #2
avatar+169 
+2

Or use point slope

we know slope is 3

so

 \(y-3=3(x-4)\\ y-3=3x-12\\ y=3x-9 \)

so -9

 Aug 8, 2020
edited by Inspirational  Aug 8, 2020

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