happycheese
New member
- Joined
- Jan 7, 2013
- Messages
- 2
what is y=2x+18
Help!
- Thread starter happycheese
- Start date
pka
Elite Member
- Joined
- Jan 29, 2005
- Messages
- 11,971
An equation?
happy cheese,
y=2x+18 is the equation of straight line.
You know that x-axis is horizontal right.
Now, tilt a line that is along x-axis by 63.4 degrees (in the counter-clockwise) and push it up 18 units, then you end up with the line y=2x+18.
In the equation, '2' is called the slope. Sounds boring? Here 2=tan(theta) and theta=atan(2)=63.4 degrees as mentioned previously.
Is this what you needed help with?
Cheers,
Sai.
Note: The equation of x-axis is y=0. Does that make sense? Can you explain why?
y=2x+18 is the equation of straight line.
You know that x-axis is horizontal right.
Now, tilt a line that is along x-axis by 63.4 degrees (in the counter-clockwise) and push it up 18 units, then you end up with the line y=2x+18.
In the equation, '2' is called the slope. Sounds boring? Here 2=tan(theta) and theta=atan(2)=63.4 degrees as mentioned previously.
Is this what you needed help with?
Cheers,
Sai.
Note: The equation of x-axis is y=0. Does that make sense? Can you explain why?
happycheese
New member
- Joined
- Jan 7, 2013
- Messages
- 2
it kinda did i was woundering more where the points would go on a graph
- Joined
- Nov 24, 2012
- Messages
- 3,021
The line is given in the slope-intercept form. We know one point is (0,18) (the y-intercept). Since the slope is 2, move one unit to the right and two units up to the point (1,20). Now extend a line through these two points and you have a graph of the line.