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anonymous
 one year ago
which equation describes a line that is NOT parallel to the lines described by the other three equations?
1. 2x+7y=8
2. 6x21y=5
3.10.5y=3x
4.y+8=(2/7)(x7)
anonymous
 one year ago
which equation describes a line that is NOT parallel to the lines described by the other three equations? 1. 2x+7y=8 2. 6x21y=5 3.10.5y=3x 4.y+8=(2/7)(x7)

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mathstudent55
 one year ago
Best ResponseYou've already chosen the best response.1Can you check the third equation?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Yup thats the exact one on my test. its 10.5y=3x

mathstudent55
 one year ago
Best ResponseYou've already chosen the best response.1Ok. Solve each equation for y and write it in the form y = mx + b. m, the number that multiplies x, is the slope.

mathstudent55
 one year ago
Best ResponseYou've already chosen the best response.1Let's try the first one: \(2x+7y=8\) Subtract 2x from both sides: \(7y = 2x + 8\) Divide both sides by 7: \(y = \dfrac{2}{7} x + \dfrac{8}{7} \) The slope is \(\dfrac{2}{7} \) Now do the same to all other equations and compare their slopes.

mathstudent55
 one year ago
Best ResponseYou've already chosen the best response.1By "do the same to all other equations" I mean solve all other equations for y and put them in the y = mx + b form.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0ok so 2x+7y=8 is y=2x/7+8/7 6x21y=5 is y=2x/7+5/21 10.5y=3x is y=0.28571429x and y+8=2/7(x7) is y=2x/710

anonymous
 one year ago
Best ResponseYou've already chosen the best response.01. slope is 2/7 2. slope is 2/7 3. slope is 0.28571429 4. slope is 2/7

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0so is it 3? @mathstudent55

mathstudent55
 one year ago
Best ResponseYou've already chosen the best response.1\(6x21y=5\) \(21y = 6x  5\) \(y = \dfrac{6}{21}x + \dfrac{5}{21} \) \(y = \dfrac{2}{7}x + \dfrac{5}{21} \) Correct.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Thankyou so much for your help!

mathstudent55
 one year ago
Best ResponseYou've already chosen the best response.1\(10.5y=3x\) \(y =  \dfrac{3}{10.5} x \) \(y =  \dfrac{6}{21} x \) \(y =  \dfrac{2}{7} x \) Incorrect.

mathstudent55
 one year ago
Best ResponseYou've already chosen the best response.1You should keep the third one as a fraction. The you will see that the third one is also 2/7. The answer is D, 2/7

mathstudent55
 one year ago
Best ResponseYou've already chosen the best response.11. slope is 2/7 2. slope is 2/7 3. slope is 0.28571429 = 2/7 4. slope is 2/7 The only different slope is D.
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