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Graph the Linear Equation \(-y + \frac{3}{5}x = 0\) (Slope-Intercept Form)
Mathematics
Grade 8
Question Content
Graph the linear equation \(-y + \frac{3}{5}x = 0\).
Correct Answer
The graph is a straight line passing through the origin (0, 0) with a slope of \(\frac{3}{5}\) (e.g., passing through (5, 3) and (-5, -3)).
Detailed Solution Steps
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Step 1: Rearrange the equation to slope-intercept form (\(y = mx + b\)): \nStart with \(-y + \frac{3}{5}x = 0\). Add \(y\) to both sides: \(\frac{3}{5}x = y\), so \(y = \frac{3}{5}x\).
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Step 2: Identify the y-intercept (\(b\)) and slope (\(m\)): \n- The y-intercept \(b = 0\), so the line passes through \((0, 0)\). \n- The slope \(m = \frac{3}{5}\) (rise = 3, run = 5).
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Step 3: Plot a second point using the slope: \nFrom \((0, 0)\), move 5 units right (run) and 3 units up (rise) to \((5, 3)\). (Alternatively, move 5 units left and 3 units down to \((-5, -3)\).)
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Step 4: Draw a straight line through the points \((0, 0)\) and \((5, 3)\) (or \((-5, -3)\)).
Knowledge Points Involved
1
Slope-Intercept Form
The form \(y = mx + b\) where \(m\) is the slope (rate of change) and \(b\) is the y-intercept (where the line crosses the y-axis). This form simplifies graphing by directly revealing the line’s slope and a starting point (the y-intercept).
2
Slope Definition
Slope \(m = \frac{\text{rise}}{\text{run}}\), representing the vertical change (\(\text{rise}\)) divided by the horizontal change (\(\text{run}\)) between two points on the line. A positive slope (\(\frac{3}{5}\)) means the line rises from left to right.
3
Graphing Linear Equations
To graph a linear equation, convert it to slope-intercept form, plot the y-intercept, then use the slope to find a second point. Draw a line through these points. This method leverages the slope and y-intercept to efficiently plot the line.
4
Solving for \(y\) in Linear Equations
Rearranging an equation to isolate \(y\) (e.g., \(y = \frac{3}{5}x\)) reveals key features (slope, y-intercept) needed for graphing. This algebraic manipulation is essential for analyzing linear relationships.
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