Question

What is the equation of the line:

Answer 1

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

\[m=\frac{y_2-y_1}{x_2-x_1}\]

Answer 2

so do i divide

Answer 3

for the gradient or slope? yes

Answer 4

which 2 points should i pick

Answer 5

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

Answer 6

is 3 correct

Answer 7

Yes it is. So what is your equation?

Answer 8

idk i'm lost

Answer 9

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?

Answer 10

4.5

Answer 11

-4.5

Answer 12

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

Answer 13

ty