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Which equation represents the graph?

A. y= -1/3 x -1
B. y= -3x -1
C. y= -1/3 x + 1/3
D. y= -3x + 1/3

Which equation represents the graph? A. y= -1/3 x -1 B. y= -3x -1 C. y= -1/3 x + 1/3 D-example-1
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User Doosh
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1 Answer

4 votes

Answer:

Second option:

y = - 3x - 1

Explanation:

The line cuts the y-axis at y = -1; this is the y-intercept of the slope-line equation and corresponds to the constant term in the equation

The equation of the line will be of the form
y = mx - 1

where m is the slope

To find slope, find two points on the line(x1, y1) and (x2, y2) which can be easily distinguished

The difference between their y values is called the rise: y2 - y1

The difference between the corresponding x values is called the run: x2 - x1

Slope m = rise/run

In the graph, two easily distinguishable points are (0, -1) and (1, -4)

Therefore rise = y2 - y1 = -4 - (- 1) = -4 + 1 = -3

run = x2 - x1 = 1 - 0 = 1

Slope = -3/1 = -3

Therefore the equation of the line is
y = - 3x - 1

This is the second option

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User Adrelanos
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