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michaelfinley213
Find the Equation of a Line Given That You Know Two Points it Passes Through. The equation of a line is typically written as y=mx+b where m is the slope and b is the y-intercept.
choixongdong
y = -2x + 4 slope = -2
perpendicular lines, slope is opposite and reciprocal 
so slope = 1/2

passing thru (4,2)
y =  mx + b
b = y - mx
b = 2 - 1/2(4)
b = 2 - 2
b = 0

answer
A. 
equation
y = 1/2x


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