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Mrather

  • one year ago

Which equation describes the four ordered pairs (-1,-3), (0,1), (2,9), (3,13)? A. y=2x+1 B. y=4x+1 C. y=4x-1 D. y=2x-1

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  1. sritama
    • one year ago
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    B

  2. incomplte
    • one year ago
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    B

  3. Callisto
    • one year ago
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    Explanations?

  4. sritama
    • one year ago
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    put the values of x and y in the equations and find in which case 4 of them are satisfying the equation.

  5. kirbykirby
    • one year ago
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    Or there's a more systematic way of doing it:

  6. kirbykirby
    • one year ago
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    They give you the point (0,1) which is |dw:1358396550543:dw| your y-intercept in the formula y = mx+b, so b = 1 Now for the slope, take two points and calculate it using the slope formula: If we take points (-1,-3) and (0,1):\[m=\frac{(-3)-(1)}{(-1)-(0)}= \frac{-4}{-1}=4\] So, y = 4x+1

  7. kirbykirby
    • one year ago
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    (And I guess you can assume the other points are valid for this equation since there is no option such as "none of the above")

  8. kirbykirby
    • one year ago
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    What sritama told you is perfectly valid as well, but perhaps a bit more time consuming

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