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Given:  y= -3x – 4

a. Identify the slope         b.  Identify the Y intercept

Answer a. = -3    and b. = -4

Guest Oct 30, 2014

Best Answer 

 #5
avatar+93616 
+10

y=-3x-4

The y interecept is -4.   This is just a point  (0,-4)  So mark this on the y axis.

now

The gradient is        $$-3\; =\; \frac{-3}{1}$$

 

Now if a line has a negative gradient this means that the top of it will be on the LEFT hand side of the page.

Starting at the y intercept.   Go up 3 spaces.  Then go side ways 3 spaces in the LEFT (or neg) direction.

Mark the point where you end up.  

Join the points and you have your line.   

You should write the equation of the line on the line  

 

Melody  Oct 31, 2014
 #1
avatar+89775 
+5

Good job....you are correct....

 

CPhill  Oct 30, 2014
 #2
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0

Thanks. How do I graph the line?

Guest Oct 30, 2014
 #3
avatar+89775 
+5

One method is to just select a value for x and substitue it into the equation to  find y.

Then, select another value for x and substitute that into the equation to find a second y.

Plot both points on a graph and draw a line between them.

Hint.... ( I might use 0 and 1 for the two x values to substitute)....post back if you have trouble

 

CPhill  Oct 30, 2014
 #4
avatar
+5

I'm no where near knowing how to do this graph thing. I'm so lost and confused :/

Guest Oct 31, 2014
 #5
avatar+93616 
+10
Best Answer

y=-3x-4

The y interecept is -4.   This is just a point  (0,-4)  So mark this on the y axis.

now

The gradient is        $$-3\; =\; \frac{-3}{1}$$

 

Now if a line has a negative gradient this means that the top of it will be on the LEFT hand side of the page.

Starting at the y intercept.   Go up 3 spaces.  Then go side ways 3 spaces in the LEFT (or neg) direction.

Mark the point where you end up.  

Join the points and you have your line.   

You should write the equation of the line on the line  

 

Melody  Oct 31, 2014
 #6
avatar+89775 
0

Thanks for that excellent answer, Melody.........I hope "Anonymous" understood it better after that...

 

CPhill  Oct 31, 2014
 #7
avatar+93616 
+5

Thanks Chris,

I really like it when people ask for clarification.

It means that they are really trying to learn from our answers and that is what we want.  :)

Melody  Oct 31, 2014
 #8
avatar
+5

I surely did understand it. Thank you both. 

As for anonymous. My name is Kim and I'm not good at math. 

Guest Oct 31, 2014

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