equation of the line given the slope and the y intercept

[Jill Ratliff]

:?: Need help. slope is -3 and the y intercept is (0,0)

Need to know how to write the equation of the line with the given information.

 

[Loren]

Need help. slope is -3 and the y intercept is (0,0)

m=-3,.....\(\displaystyle x_1=0\),.....\(\displaystyle y_1=0\)

Use \(\displaystyle y-y_1 = m(x-x_1)\)

And next time please show us what the exact question is and show what you have done so far.

 

[Mrspi]

:?: Need help. slope is -3 and the y intercept is (0,0)

Need to know how to write the equation of the line with the given information.

You can start with the "slope-intercept form" for the equation of a line:

y = mx + b

"m" is the slope, and "b" is the y-intercept.

You're given the slope, -3:

y = -3x + b

You're also told that the y-intercept is (0, 0), so the line crosses the y-axis where y = 0. Substitute 0 for "b"....

y = -3x + 0

y = -3x