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Please help! [closed]

asked 2014-07-18 14:35:35 -0600

Iamastudent gravatar image

updated 2014-07-18 20:29:32 -0600

11x+15y+23=0, 7x-2y-20=0 I tried,

11x+15y+23=0------1 7x-2y-20=0-----------2

11x+15y=-23 =>y=-23x-11x/15 (substituting the value of y in eq 2)

11x+15(-23x-11x/15)=20

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Closed for the following reason question is off-topic or not relevant by slelievre
close date 2014-07-18 20:23:14.633861

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answered 2014-07-18 16:25:45 -0600

Gregory Bard gravatar image

To do this in Sage, I tried the following, which worked:

var("x y") solve( [11x+15y+23 ==0, 7x-2y-20 == 0], [x,y] )

However, I'm wondering if what you really want to know is how to do this by hand... If so, please consider reading

  • Ch 1, Sec 2 "Intersecting Two Lines, Part One"
  • Ch 1, Sec 3 "Intersecting Two Lines, Part Two"

of my free electronic online textbook-in-progress for the freshmen math course that business majors take: "Finite & Financial Mathematics for University Freshmen." All you have to do is:

  • Go to www.gregorybard.com
  • Click on "Finite Math" on the left hand side of the page
  • Each section is its own pdf file.
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Why is your answer appearing with so much bold?

kcrisman gravatar imagekcrisman ( 2014-07-19 23:03:52 -0600 )edit

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Asked: 2014-07-18 14:35:35 -0600

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Last updated: Jul 18 '14