Help with systems of equations

Quadratic equations and inequalities, variation equations, function notation, systems of equations, etc.
bellerum23
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Help with systems of equations

Postby bellerum23 » Thu Oct 31, 2013 4:53 pm

(1,2) {y=3x+5}
{y = x + 4}

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stapel_eliz
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Postby stapel_eliz » Thu Oct 31, 2013 5:41 pm

bellerum23 wrote:(1,2) {y=3x+5}
{y = x + 4}

What were the instructions for the above? What are you supposed to be doing with this? What is the meaning of the "(1,2)", and how does this relate to the two linear equations? What have you tried so far? Which methods have you been taught for solving systems of linear equations (assuming you're solving)? How far have you gotten in using one or another of those methods?

Please be complete. Thank you! :wink:

jg.allinsymbols
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Re: Help with systems of equations

Postby jg.allinsymbols » Thu Oct 31, 2013 7:43 pm

bellerum23 wrote:(1,2) {y=3x+5}
{y = x + 4}


That appears to be a system of two linear equations in two variables and a point either known or given. That point is NOT a solution of the first equation. It is also not a solution of the system.
2=1+4, FALSE.
2=3*1+5, FALSE.

bellerum23
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Re: Help with systems of equations

Postby bellerum23 » Fri Nov 01, 2013 12:39 am

Thank You for your help.

Solve each systems by graphing, if possible.

{ x - y = 4
{ 2x + y = 5

FWT
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Re: Help with systems of equations

Postby FWT » Fri Nov 01, 2013 11:21 am

bellerum23 wrote:Solve each systems by graphing, if possible.

{ x - y = 4
{ 2x + y = 5

What did you get when you graphed?

bellerum23
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Re: Help with systems of equations

Postby bellerum23 » Fri Nov 01, 2013 10:46 pm

FWT wrote:
bellerum23 wrote:Solve each systems by graphing, if possible.

{ x - y = 4
{ 2x + y = 5

What did you get when you graphed?


I haven't got the answer yet, but do I switch the numbers around to y-intercept form?

FWT
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Re: Help with systems of equations

Postby FWT » Sat Nov 02, 2013 12:25 am

Yeh, that helps. They show how to use that form to do the graphing. Then the solution is where the lines cross.

jg.allinsymbols
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Re: Help with systems of equations

Postby jg.allinsymbols » Sat Nov 02, 2013 4:02 am

bellerum23,

How you solve graphically depends what you learned in your course up to now. What techniques are you expected to use? Do you make a coordinate table for each equation and plot the points and then draw a line? Do you convert each equation to Slope-Intercept form and use the features to plot each line? Either way, you identify the point where the two lines intersect, if they do intersect.


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