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Line [tex]$AB$[/tex] passes through [tex]$A(-3,0)$[/tex] and [tex]$B(-6,5)$[/tex]. What is the equation of the line that passes through the origin and is parallel to line [tex]$AB$[/tex]?

A. [tex]$5x - 3y = 0$[/tex]
B. [tex]$-x + 3y = 0$[/tex]
C. [tex]$-5x - 3y = 0$[/tex]
D. [tex]$3x + 5y = 0$[/tex]
E. [tex]$-3x + 5y = 0$[/tex]


Sagot :

To find the equation of the line that passes through the origin (0, 0) and is parallel to the line that passes through points [tex]\( A(-3, 0) \)[/tex] and [tex]\( B(-6, 5) \)[/tex], follow these steps:

### Step 1: Find the Slope of Line [tex]\(AB\)[/tex]
The slope [tex]\( m \)[/tex] of a line passing through two points [tex]\((x_1,y_1)\)[/tex] and [tex]\((x_2,y_2)\)[/tex] is given by:
[tex]\[ m = \frac{y_2 - y_1}{x_2 - x_1} \][/tex]
Substituting the coordinates of points [tex]\( A \)[/tex] and [tex]\( B \)[/tex]:
[tex]\[ m = \frac{5 - 0}{-6 - (-3)} \][/tex]
[tex]\[ m = \frac{5}{-6 + 3} \][/tex]
[tex]\[ m = \frac{5}{-3} = -\frac{5}{3} \][/tex]

### Step 2: Determine the Equation of the Line through the Origin
The slope of the line passing through the origin and parallel to line [tex]\(AB\)[/tex] will be the same as the slope of line [tex]\(AB\)[/tex].

The slope-intercept form of a line is:
[tex]\[ y = mx + c \][/tex]
Since the line passes through the origin (0, 0), the y-intercept [tex]\( c \)[/tex] is 0. Thus, the equation is:
[tex]\[ y = -\frac{5}{3}x \][/tex]

### Step 3: Convert to Standard Form
To convert [tex]\( y = -\frac{5}{3}x \)[/tex] to standard form [tex]\( Ax + By = C \)[/tex]:
1. Multiply both sides by 3 to eliminate the fraction:
[tex]\[ 3y = -5x \][/tex]
2. Rearrange all terms to one side to get the equation in standard form:
[tex]\[ 5x + 3y = 0 \][/tex]

### Conclusion
The correct equation of the line that passes through the origin and is parallel to the line passing through points [tex]\( A(-3, 0) \)[/tex] and [tex]\( B(-6, 5) \)[/tex] is:
[tex]\[ 5x + 3y = 0 \][/tex]
This corresponds to option [tex]\( \boxed{A} \)[/tex].
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