anonymous
  • anonymous
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Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
anonymous
  • anonymous
Sure thing. First you want to identify the slope and the vertical-intercept.
anonymous
  • anonymous
Let's start with the first one: y=-2x+1
anonymous
  • anonymous
First you should find the solutions for x and y. Then you should plot a minimum of two points(for that you have to find two pairs of solutions). The line joining these two points will be the graph.

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anonymous
  • anonymous
do you start at -2 and go up one over one? for the first one?
anonymous
  • anonymous
oops... you're backwards there.
anonymous
  • anonymous
You start at +1 on the y-axis, then you move down two and right 1.
anonymous
  • anonymous
so for the second one do i start at -5?
anonymous
  • anonymous
It should look something like this: |dw:1332820224868:dw|
anonymous
  • anonymous
Yes, for the second one, you do start at -5 on the y-axis
anonymous
  • anonymous
and i go up one over one right? lol
anonymous
  • anonymous
Yes (as long as by 'over' you mean 'right'). ;)
anonymous
  • anonymous
yeah. lol so how do i tell if they have one solution, no solution or many solutions?
anonymous
  • anonymous
Well, the one solution, no solutions, or infinitely many solutions has to do with systems of equations. So far, we've been talking about graphing a single equation.
anonymous
  • anonymous
Systems involve two linear equations on the same coordinate system.
anonymous
  • anonymous
From graphing, we could have 1 of 3 things happen. I'll draw the situations for ya...
anonymous
  • anonymous
this is how my graph looks like lol does it look right?
anonymous
  • anonymous
|dw:1332820522953:dw|
anonymous
  • anonymous
Oh, let me check it out!
anonymous
  • anonymous
Yes, that looks great!
anonymous
  • anonymous
So, how would you write your answer?
anonymous
  • anonymous
idk
anonymous
  • anonymous
You would write the answer: (2,-3)
anonymous
  • anonymous
The answer is the ordered pair that is the solution.
anonymous
  • anonymous
wouldnt it be -2, 3
anonymous
  • anonymous
No, remember, the x is listed first, and the y is listed second.
anonymous
  • anonymous
-2, 3 would be left two and up three.
anonymous
  • anonymous
oh right, can you help me with the next one? its y= -2x + 2 and y= x+5
anonymous
  • anonymous
Sure thing. Are you solving by graphing again?
anonymous
  • anonymous
yes
anonymous
  • anonymous
Alright - How would you graph the first one?
anonymous
  • anonymous
start at 2 and go down 2 and over one?
anonymous
  • anonymous
Now, rather than use the word 'over' use 'left' or 'right'. I can't tell which way 'over' means to you. :)
anonymous
  • anonymous
the right i think
anonymous
  • anonymous
Correct! :)
anonymous
  • anonymous
How would you graph the second equation?
anonymous
  • anonymous
start at 5 go up one to the right 1?
anonymous
  • anonymous
Perfect! :)
anonymous
  • anonymous
Where do they intersect?
anonymous
  • anonymous
1, 4 ??
anonymous
  • anonymous
I'm thinking maybe -1 and 4? Let me double-check.
anonymous
  • anonymous
Yeah, I'm thinking -1,4
anonymous
  • anonymous
Remember, you're going to the left 1 and then up 4.
anonymous
  • anonymous
alright haha i think im starting to get this, i just dont understand in class because my teacher just writes everything down and doesnt even explain what to do lol
anonymous
  • anonymous
Ask the teacher to explain. Trust me - I'm a math teacher. If you've got the question, there are at least 5 other students with the same question. You'll be doing the whole class a favor.
anonymous
  • anonymous
my teacher makes us all do questions infront of the class everyday and i never know what to do and everyone calls me stupid ... lol
anonymous
  • anonymous
:( that's sad.
anonymous
  • anonymous
Well, you'll know what to do for tomorrow, right? :)
anonymous
  • anonymous
i know, and when its their turn they do the same exact thing.. its really annoying but the teacher never says anything lol
anonymous
  • anonymous
and yes thank you :)
anonymous
  • anonymous
Right on! :) Well, good luck tomorrow!! XD

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