ASKSAGE: Sage Q&A Forum - RSS feedhttps://ask.sagemath.org/questions/Q&A Forum for SageenCopyright Sage, 2010. Some rights reserved under creative commons license.Sun, 20 Jul 2014 06:03:52 +0200Please help!https://ask.sagemath.org/question/23473/please-help/ 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)=20Fri, 18 Jul 2014 21:35:35 +0200https://ask.sagemath.org/question/23473/please-help/Answer by Gregory Bard for <p>11x+15y+23=0, 7x-2y-20=0
I tried,</p>
<p>11x+15y+23=0------1
7x-2y-20=0-----------2</p>
<p>11x+15y=-23
=>y=-23x-11x/15 (substituting the value of y in eq 2)</p>
<p>11x+15(-23x-11x/15)=20</p>
https://ask.sagemath.org/question/23473/please-help/?answer=23478#post-id-23478# To do this in Sage, I tried the following, which worked:
var("x y")
solve( [11*x+15*y+23 ==0, 7*x-2*y-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. Fri, 18 Jul 2014 23:25:45 +0200https://ask.sagemath.org/question/23473/please-help/?answer=23478#post-id-23478Comment by kcrisman for <h1>To do this in Sage, I tried the following, which worked:</h1>
<p>var("x y")
solve( [11<em>x+15</em>y+23 ==0, 7<em>x-2</em>y-20 == 0], [x,y] )</p>
<h1>However, I'm wondering if what you really want to know is how to do this by hand... If so, please consider reading</h1>
<ul>
<li>Ch 1, Sec 2 "Intersecting Two Lines, Part One"</li>
<li>Ch 1, Sec 3 "Intersecting Two Lines, Part Two"</li>
</ul>
<h1>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:</h1>
<ul>
<li>Go to <a href="http://www.gregorybard.com">www.gregorybard.com</a></li>
<li>Click on "Finite Math" on the left hand side of the page</li>
<li>Each section is its own pdf file. </li>
</ul>
https://ask.sagemath.org/question/23473/please-help/?comment=23495#post-id-23495Why is your answer appearing with so much bold?Sun, 20 Jul 2014 06:03:52 +0200https://ask.sagemath.org/question/23473/please-help/?comment=23495#post-id-23495