# Thread: Equation of straight line

1. ## 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.

2. ## Re: Equation of straight line

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).

4. ## Re: Equation of straight line

Originally Posted by haftakhan
Are you saying that you cannot use the slope intercept form?

5. ## Re: Equation of straight line

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?