Graphing Linear Functions Flashcards
Grade 9 · Math · Flashcards
Key vocabulary for graphing and interpreting linear functions in Grade 9 Math.
Flashcards
- Slope-intercept form
- y = mx + b; m is slope, b is y-intercept
- Standard form
- Ax + By = C; useful for finding both intercepts quickly
- Slope
- Rise over run: m = (y₂ − y₁)/(x₂ − x₁)
- Y-intercept
- Point where line crosses y-axis; set x = 0
- X-intercept
- Point where line crosses x-axis; set y = 0
- Positive slope
- Line rises from left to right (m > 0)
- Negative slope
- Line falls from left to right (m < 0)
- Zero slope
- Horizontal line — output never changes (m = 0)
- Undefined slope
- Vertical line — run = 0, so slope cannot be calculated
- Parallel lines
- Equal slopes, different y-intercepts; never intersect
- Perpendicular lines
- Slopes are negative reciprocals; m₁ × m₂ = −1
- Rate of change
- How much y changes per unit increase in x; equals the slope
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