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| Graph of Linear Equation in one variable |
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| ax + b = 0 is a linear equation in one variable. |
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| Consider the equation 2x + 4 = 0 |
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| 2x = -4 |
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| x = -2 |
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| Since this equation is independent of y, for all values of y, x = -2 |
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| Hence x = -2 is a line parallel to the y-axis at x = -2. |
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| Consider the equation y - 5 = 0 |
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| y - 5 = 0 |
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| y = 5 |
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| Since this equation is independent of x, for all values of x, y = 5. |
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| Hence the graph of y = 5 is a line parallel to the x-axis at y = 5. |
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| The graph of x = a is a line parallel to y-axis at x=a. The graph of y=b is a line parallel to x-axis at y = b. |
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Linear equations in two variables
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