If one point on a line is (2, −6) and the line's slope is -3/2, find the y-intercept.

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Recall the slope-intercept form of a line: \(y = mx + b\), where \(m\) is the slope and \(b\) is the y-intercept.

Substitute the given slope \(m = -\frac{3}{2}\) into the equation: \(y = -\frac{3}{2}x + b\).

Use the given point \((2, -6)\) by substituting \(x = 2\) and \(y = -6\) into the equation: \(-6 = -\frac{3}{2} \times 2 + b\).

Simplify the multiplication on the right side: \(-6 = -3 + b\).

Solve for \(b\) by adding 3 to both sides: \(b = -6 + 3\).

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주요 개념

질문에 올바르게 답하기 위해 반드시 이해해야 하는 핵심 개념들은 다음과 같습니다.

Slope of a Line

The slope measures the steepness and direction of a line, defined as the ratio of the change in y to the change in x between two points. It is often represented as 'm' and is crucial for writing the equation of a line.

Slope-Intercept Form of a Line

The slope-intercept form is y = mx + b, where m is the slope and b is the y-intercept. This form allows easy identification of the line's slope and where it crosses the y-axis, facilitating the calculation of unknown parameters.

Using a Point to Find the Y-Intercept

Given a point (x, y) on the line and the slope m, substitute these values into y = mx + b to solve for b, the y-intercept. This method uses known information to find the line's vertical intercept.