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# Write an equation in slope-intercept form for the line that passes through (-5,3) and is perpendicular to the line described by y= 5x.

Write an equation in slope-intercept form for the line that passes through (-5,3) and is perpendicular to the line described by y= 5x.

### 3 Answers by Expert Tutors

Vivian L. | Microsoft Word/Excel/Outlook, essay composition, math; I LOVE TO TEACHMicrosoft Word/Excel/Outlook, essay comp...
3.0 3.0 (1 lesson ratings) (1)
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Hi Haley;
Write an equation in slope-intercept form for the line that passes through (-5,3) and is perpendicular to the line described by y= 5x.
The equation is in slope-intercept form...
y=mx+b
m is the slope.
b is the y-intercept, the value of y when x=0.
y=5x
Slope is 5
y-intercept is zero.  However, this will be a non-issue when establishing the perpendicular equation.
In such equation, the slope is -1/5.
y=(-1/5)x+b
Let's apply the point-slope formula...
(y-y1)=m(x-x1)
y-3=(-1/5)(x--5)
y-3=(-1/5)(x+5)
y-3=(-1/5)x-1
y=(-1/5)x+2
Amarjeet K. | Professional Engineer for Math and Science TuroringProfessional Engineer for Math and Scien...
4.6 4.6 (8 lesson ratings) (8)
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Given line y = 5x
compare with slope intercept line equation y = mx + b where m is slope
therefore slope of given line is 5

Slope of new line is perpedicular to given line
therefore its slope is - 1/5

equation of new line

y = -1/5x + b
since it passes through -5,3

3 = -1/5x(-5) + b

b = 2

equation of new line

y = -1/5 x + 2
Parviz F. | Mathematics professor at Community CollegesMathematics professor at Community Colle...
4.8 4.8 (4 lesson ratings) (4)
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L1l : Y = 5X

L2:   Y = -1/5 X +b    /passes through ( -5.3)

3 = -1/5(-5) +b

b = 3 - 1 = 2

L2 : Y = -1/5 X + 2