The slope of a line perpendicular to the above line will be the negative reciprocal
m1*m2=-1
The slope of the required line will be -0.20=> -1/5
m= - 1/5 ,point ( 0 , 6 )
Find b by plugging the values of m & the point in
y=mx+b
6 = + b
b= 6
m= - 1/5
The required equation is y =- 1/ 5x+ 6
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