Asked by D4VD
Kelsey graphed the equation y = 3x + 1 as shown below.
On a coordinate plane, a line goes through points (negative 3, 0) and (0, 3).
Which describes Kelsey’s error?
Kelsey graphed the y-intercept on the x-axis.
Kelsey graphed –3 instead of 3 as the y-intercept.
Kelsey graphed the slope as up 1 right 1 instead of up 1 left 1.
Kelsey graphed the slope as the y-intercept and the y-intercept as the slope.
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Answer: Kelsey graphed the slope as the y-intercept and the y-intercept as the slope.
Reason: The line through (−3,0) and (0,3) has slope (3−0)/(0−(−3)) = 1 and y-intercept 3. The equation y = 3x + 1 has slope 3 and y-intercept 1, so Kelsey swapped them.
Reason: The line through (−3,0) and (0,3) has slope (3−0)/(0−(−3)) = 1 and y-intercept 3. The equation y = 3x + 1 has slope 3 and y-intercept 1, so Kelsey swapped them.
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