Noblieron Noblieron
  • 29-12-2017
  • Mathematics
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if f(x) is a linear function that passes through the points (4,3) and (-4,-9), what is the y-intercept of f(x) ?

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icedipping
icedipping icedipping
  • 29-12-2017
The gradient of the line is calculated as (3 - (-9))/(4 - (-4)) = 1.5

Writing it in point-slope form, you get y-3 = 1.5(x-4)

This gives y = 1.5x - 3 giving a y-intercept of -3.
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