Write an equation of a line perpendicular to y =1/4 x + 4 in slope-intercept form that passes through the point (-2, 6).

Question

mrnood · Answer

from the equation
y=1/4 x +4
what is the slope of that line?

(hint: In the form y=mx+b : m is the slope)

anonymous · Answer

the slope is 1/4 so the new slope would be -4

anonymous · Answer

im having trouble on how to find the b of the new equation

anonymous · Answer

@MrNood do you know how to do that
?

mrnood · Answer

ok so you have the new slope so the equation of th enew line would be

y = -4x + b

but you know that the point (-2,6) lies on the line

so when x=-2 y= 6

so put those 2 numbers in the equation = and you will find b

anonymous · Answer

okay 
so 
6 = -4 * -2 + b
6 = 8 + b
b = -2

Is that right @MrNood

mrnood · Answer

check it by putting it back into the equation ....

(it looks right to me...)

anonymous · Answer

so the final answer would be y = -4 x - 2 right?

mrnood · Answer

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