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Provide a 150 word response to the following questions. Write an equation of a line in...

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christiano-cr7 | Salutatorian

Posted June 27, 2013 at 5:31 AM via web

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Provide a 150 word response to the following questions.

Write an equation of a line in standard form (i.e., Ax + By = C form).

Re-write that same equation in slope-intercept (i.e., y = mx + b) form (show the work). Identify the slope and y intercept. Describe this graph (i.e., where does it cross the y axis? Is the line slanting upward or downward? How steep is the line slanting?).

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aruv | High School Teacher | Valedictorian

Posted June 27, 2013 at 6:00 AM (Answer #1)

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`Ax+By=C` , it is in an equation of straight line because both

power of x and power of y are one. However in some text book the standard form of line is `Ax+By+C=0` .So you can ref you text book.

I consider your equation `Ax+By=C`

Transfer x term from left to right.

`By=-Ax+C` ,

`y=(-A/B)+C/B`     (i)

which is now in form of slope intercept form

`y=mx+c`        (ii)

compare equations (i) and (ii),you will get

slope=m=`(-A/B)`  and

intercept  `c=C/B` .

solpe is negative or positive ,it depend on sign of A and B

1. A is positive and B is negative then slope m >0.

2. A is negative and B is positive  then slope m >0

i.e. if A and B are opposite in sign then slope will positive.

if A and B are of same sign then slope will negative.

It will cross y axis  at (0,`C/B`  ).

You can better understand if consider some fixed numbers other than A,B, and C.

 

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