Determine if the graphs of the given equations are parallel.
y=2x+7
7y+2x=4
what is the slope of the line y=2x+7
what is the slope of the line 7y+2x=4
Are the graphs parallel?

- anonymous

- jamiebookeater

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- anonymous

slope form
y = mx + b; m is the slope

- anonymous

what is the slope of the line 7y+2x=4

- anonymous

Honestly, I am seriosly lost on this question.. I dont even know where to start

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## More answers

- anonymous

so for the first one 2 is the slope?

- precal

if the slopes are the same, the lines are parallel

- anonymous

ok try solving for y
7y+2x=4

- anonymous

I feel silly but what would be my first step?

- anonymous

subtract 2x from both sides

- anonymous

The slope would be -2?

- anonymous

for the first?

- anonymous

nope write the whole thing
1st equation slope is 2

- anonymous

ok..... so the second would be the same then?

- anonymous

no, try solving for y, will help u

- anonymous

oh my ok.. let me work this out.. Just a sec

- anonymous

It would be 4?

- anonymous

nope
7y+2x=4
subtract 2x from both sides

- anonymous

sorry I thought I did.. this is embaressing ... ok just a sec

- anonymous

For some reason I just keep getting 2

- anonymous

7y+2x=4
-2x -2x
7y = -2x + 4 is that correct?

- anonymous

(4-2x)/7

- anonymous

yes

- anonymous

correct
one extra step
y = -2/7x + 4/7
whats the slope

- anonymous

is it undefined?

- anonymous

y = mx + b
m = -2/7

- anonymous

I dont see where I went wrong....

- anonymous

|dw:1355175754668:dw|

- anonymous

Oh ok I see that now. WOW how confusing... I hope I can handle the next on my own.. Thanks for your generous help...

- anonymous

Ok so how would I go about doing a question that asked me this... slope intercept equation of the line whose graph is parallel to y=2x-5 and has te y-interceot (0,9)
There is no way I could do that one on my own!

- anonymous

they are parallel so the slope will stay the same
y - y1 = m(x -x1)
y - 9 = 2*(x-0)
y - 9 = 2x
+9 +9
y = 2x + 9

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