Equation of straight line

• Jun 17th 2011, 11:39 AM
haftakhan
Equation of straight line
How to solve this ?

A straight line L passes through the point (0,-1) and is parallel to the straight line y=3x+1

a) write down the equation of the straight line L.

b) Given that L passes through the point (2,b) find the value of b.
• Jun 17th 2011, 11:50 AM
Plato
Re: Equation of straight line
Quote:

Originally Posted by haftakhan
How to solve this ?

A straight line L passes through the point (0,-1) and is parallel to the straight line y=3x+1

a) write down the equation of the straight line L.

b) Given that L passes through the point (2,b) find the value of b.

The slope will be 3 and the y-intercept (0,-1).
• Jun 17th 2011, 12:12 PM
haftakhan
Re: Equation of straight line
• Jun 17th 2011, 12:24 PM
Plato
Re: Equation of straight line
Quote:

Originally Posted by haftakhan

Are you saying that you cannot use the slope intercept form?
• Jun 17th 2011, 12:30 PM
Also sprach Zarathustra
Re: Equation of straight line
Quote:

Originally Posted by haftakhan
How to solve this ?

A straight line L passes through the point (0,-1) and is parallel to the straight line y=3x+1

a) write down the equation of the straight line L.

b) Given that L passes through the point (2,b) find the value of b.

A slope of all lines parallel to y=3x+1 is 3(why?)

So, for (a), you have m=3 and some point on this line , that is (0,-1)... can you construct this line?