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Which line has an equation of y = -5x + 4 in slope-intercept form?

Option 1: A line passing through the points (1, 9) and (3, 19)
Option 2: A line passing through the points (2, -14) and (4, -24)
Option 3: A line passing through the points (1, 1) and (3, 11)
Option 4: A line passing through the points (2, -5) and (4, -16)

1 Answer

2 votes

Final answer:

The student's question is about determining which option correctly represents the line with the equation y = -5x + 4. None of the options provided have points that, when used to calculate the slope or test the equation, match both the slope and y-intercept of the equation y = -5x + 4.

Step-by-step explanation:

The student is asking about the slope-intercept form of a line, which is written as y = mx + b, where m is the slope and b is the y-intercept. To find which option has an equation of y = -5x + 4, we can calculate the slopes of the lines given by the points in each option and compare them to the slope in the question (-5).

Option 2: Using points (2, -14) and (4, -24), the slope is (y2 - y1) / (x2 - x1) = (-24 - (-14)) / (4 - 2) = -10 / 2 = -5, which matches the slope of -5 from the equation y = -5x + 4. Moreover, if we insert x = 2 into the equation y = -5x + 4, we get y = -5(2) + 4 = -10 + 4 = -6, which does not match the y-value of the point (2, -14). Therefore, the line through points (2, -14) and (4, -24) cannot have the equation y = -5x + 4, because the y-values do not match. The error in y-values indicates that Option 2 is not the correct answer.

After evaluating all options, none of the given pairs of points result in a consistent y-value when plugged into the equation y = -5x + 4. Therefore, none of the provided options correctly represents the line with the equation y = -5x + 4.

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