Friday, March 22, 2013

Find the equation of the line passes through ( -3, 4) and parallel to the line 2y-4x + 2 = 0

If 2 lines are parallel, their slopes have to be
equal.


We'll put the given equation of the line in the
point slope form.


y = mx +
n


For this reason, we'll have to isolate y to the left side
and we'll add 4x and subtract 2 both sides:


2y = 4x -
2


We'll divide by 2:


y = 2x -
1


Comparing, we'll get the slope of the first line: m1 =
2


The slope of the parallel line is m2 =
2.


The line is passing through the point  (-3 , 4). The
equation of the parallel line is:


y - 4 = 2(x +
3)


We'll add 4:


y = 2(x + 3) +
4


We'll remove the brackets:


y
= 2x + 6  + 4


We'll combine like
terms:


y = 2x +
10


The equation of the parallel line is:


y = 2x +
10

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