What is the equation of the line perpendicular to y=2x-3 and that passes through (0;0)

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hala718's profile pic

hala718 | High School Teacher | (Level 1) Educator Emeritus

Posted on

Given the point (0,0) passes through the line.

Then we will write the equation of the line:

(y-y1) = m(x-x1) where (x1,y1) is any point passes through the line, and m is the slope.

==> (y-0) = m( x-0)

==> y= mx.

Now we will find the slope (m).

We are given that the equation of the perpendicular line is y=2x-3.

Then we know that the slope of the perpendicular line is 2.

Also, we know that the product of the slopes of two perpendicular lines is -1.

==> 2*m = -1

==> m = -1/2,

Now we will substituteinto the equation.

==> y= (-1/2)x

=> y= -(1/2)x

==> 2y + x = 0

justaguide's profile pic

justaguide | College Teacher | (Level 2) Distinguished Educator

Posted on

We have to find the equation of the line perpendicular to y=2x-3 and that passes through (0,0).

Now y = 2x - 3, has a slope 2

The slope of the line perpendicular to this is the neagtive inverse of -1/2.

Therefore the equation of the line passing through (0 , 0) and with the slope -1/2 is

y = (-1/2)*x

=> 2y = -x

=> x + 2y = 0

The required equation of the line perpendicular to y = 2x - 3 and that passes through (0, 0) is x + 2y = 0.

giorgiana1976's profile pic

giorgiana1976 | College Teacher | (Level 3) Valedictorian

Posted on

Two lines are perpendicular when the product of their slopes is -1. Comparing the given equation to the point slope form of an equation of a line, we'll get the slope m1 = 2.

y = mx + n

y = 2x - 3

We also know that:

m1*m2 = -1, where m2 is the slope of the perpendicular line.

m2 = -1/m1

m2 = -1/2

The equation of the perpendicular line, that passes through the origin and has the slope m2 is:

y - 0 = m2(x - 0)

y = -x/2

y = -0.5x

tonys538's profile pic

tonys538 | Student, Undergraduate | (Level 1) Valedictorian

Posted on

The slope intercept form of the equation of a line is y = mx + c where m is the slope and c is the y-intercept.

To determine the equation of a line perpendicular to y=2x-3 that passes through the point (0,0) first determine the slope of the given line.

It is in slope-intercept form and this gives the slope as 2. Now the product of the slope of two perpendicular lines is equal to -1.

If the slope of the required line is m, m*2 = -1, m = -1/2

The equation of a line with slope -1/2, and that passes through the point (0,0) is:

(y - 0)/(x - 0) = -1/2

y/x = -1/2

2y = -x

2y + x = 0

The line 2y + x = 0 is perpendicular to the line y=2x-3 and passes through (0,0)

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