anonymous
  • anonymous
What is the equation of the line:
Mathematics
jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
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anonymous
  • anonymous
y=mx+c From the graph we can see that the y-intercept is -2 To find the gradient, pick two point and enter it into this equation \[m=\frac{y_2-y_1}{x_2-x_1}\]
anonymous
  • anonymous
so do i divide

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anonymous
  • anonymous
for the gradient or slope? yes
anonymous
  • anonymous
which 2 points should i pick
anonymous
  • anonymous
it doesn't matter which they will all give you the same slope.
anonymous
  • anonymous
is 3 correct
anonymous
  • anonymous
Yes it is. So what is your equation?
anonymous
  • anonymous
idk i'm lost
anonymous
  • anonymous
Okay so you have worked out your slope which is 3 and we know the y-intercept (occurs at x=0) from looking at the graph and it was -2. This means m=3 and c=-2. The equation of a straight line is y=mx+c. All you have to do is place the values into the equation. What do you get?
anonymous
  • anonymous
4.5
anonymous
  • anonymous
-4.5
anonymous
  • anonymous
Ahh okay, y=mx+c, m=3 and c=-2. The equation of the line is then y=3x-2. And that is the answer
anonymous
  • anonymous
ty

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