## anonymous 4 years ago What is the equation of the line:

1. anonymous

2. 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 $m=\frac{y_2-y_1}{x_2-x_1}$

3. anonymous

so do i divide

4. anonymous

for the gradient or slope? yes

5. anonymous

which 2 points should i pick

6. anonymous

it doesn't matter which they will all give you the same slope.

7. anonymous

is 3 correct

8. anonymous

Yes it is. So what is your equation?

9. anonymous

idk i'm lost

10. 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?

11. anonymous

4.5

12. anonymous

-4.5

13. 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

14. anonymous

ty