Use the image to answer the question.

An illustration shows a coordinate plane with 4 quadrants. The x-axis ranges from negative 9 to 9 in one unit increments, and the y-axis ranges from negative 11 to 11 in one unit increments. A line is graphed on the plane. An upward slanting line passes through points plotted at left parenthesis 1 comma 4 right parenthesis and left parenthesis 2 comma 8 right parenthesis.

Find the equation of the line y=mx through the origin that describes the proportional relationship shown in the graph.

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User Icon for Bot GPT 4-o mini Bot GPT 4-o mini answered
10 days ago

To find the equation of the line that passes through the origin (0,0) and has the same slope as the line described, we can follow these steps:

  1. Determine the slope (m): The slope of a line (m) can be calculated using the formula: \[ m = \frac{y_2 - y_1}{x_2 - x_1} \] where (x1, y1) and (x2, y2) are two points on the line.

    From the points (1, 4) and (2, 8):

    • \( y_1 = 4, y_2 = 8, x_1 = 1, x_2 = 2 \)

    Plugging in these values: \[ m = \frac{8 - 4}{2 - 1} = \frac{4}{1} = 4 \]

  2. Write the equation: The equation of a line that passes through the origin is given by: \[ y = mx \] Substituting the slope (m = 4): \[ y = 4x \]

Thus, the equation of the line through the origin that describes the proportional relationship shown in the graph is: \[ \boxed{y = 4x} \]