Which of the following equations would graph a
line parallel to 3x − y = 7?
Checking Answers
y = 7x − 3
y = −3x + 7
--y = −7x + 3
y = 3x

Question

Which of the following equations would graph a 
line parallel to 3x − y = 7?  
Checking Answers
y = 7x − 3
y = −3x + 7
-->y = −7x + 3
y = 3x

ranga · Answer

First step is to put the equation of the line 3x - y = 7 in the slope-intercept form.

Slope intercept form is:  y = mx + b

anonymous · Answer

Okay so y = 3x - 7

ranga · Answer

Yes.  Now what is the slope of the line: y = 3x - 7 ?

Remember, in y = mx + b,   m is the slope and b is the y-intercept.

ranga · Answer

Compare y = 3x - 7   to   y = mx + b

What is the value of m?   (m is called the slope)

anonymous · Answer

7/3 is the slope?

ranga · Answer

No, if you compare y = 3x - 7 to y = mx + b
you can see m = 3  and  b = -7

So the slope of the line is 3.

anonymous · Answer

Okay that makes sense

ranga · Answer

Two lines will be parallel if they have the same slope.  
Which of the 4 choices have a slope of 3?

anonymous · Answer

2 and 4 ?

ranga · Answer

2 has a slope of -3   NOT  +3

anonymous · Answer

So 1 and 4 then?

anonymous · Answer

im going to go with one thanks for helping

ranga · Answer

No.  The answer is 4!  
Earlier you narrowed it down to 2 & 4 and I said it is not 2. 
So that leaves you with 4!

anonymous · Answer

Okay sorry , I just double checked and it didn't come out right so I came back thanks