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?
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3=4m+b (1)
12=7m+b (2)
(2)-(1) we get
9=3m
m=3 putting this value in equation (1) we get
3=4×3+b
b=3-12
b=-9
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