anonymous
  • anonymous
can someone please help me with my algebra homework? i do online school and i have no idea how to do this. it makes me so upset. could someone demonstrate how to do these? i really need help... 4x + y = 5 x - y = 1 x + 4y = 8 5x + y = 2 7x + 3y = -21
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
you have to find the x and y intercepts of the equation. i have no idea how to do that :(
kohai
  • kohai
Okay, firstly, do you know what an intercept is?
anonymous
  • anonymous
no i dont :( i dont understand it at all

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kohai
  • kohai
|dw:1446746671602:dw| An intercept is where the line crosses the axis
kohai
  • kohai
So this one has one y-intercept and two x-intercepts right?
anonymous
  • anonymous
oh ok that makes sense. and oh it has 2?
kohai
  • kohai
Yeah because on the x-axis it crosses over twice
anonymous
  • anonymous
oh i think i understand that
kohai
  • kohai
|dw:1446746759826:dw|
kohai
  • kohai
So to find it using equations, To find the x-intercept, you set y=0 To find the y-intercept, you set x=0
anonymous
  • anonymous
oh yeah! i know that part, i wrote that down in my notes. its just hard especially since i do online school
kohai
  • kohai
I understand, I had to do it that way too
kohai
  • kohai
So I'll help you through the first one okay?
anonymous
  • anonymous
ok :)
kohai
  • kohai
4x + y = 5 So to find x-intercept, set y=0 4x+y=5 4x-5=-y -4x+5=y -4x+5=0 Can you solve for x here?
anonymous
  • anonymous
when you solve for x do you just add 4x to both sides
kohai
  • kohai
To solve for x you want x on one side and a constant on another
kohai
  • kohai
So you want x by itself
anonymous
  • anonymous
oh so you would subtract 5 or 0
kohai
  • kohai
5
kohai
  • kohai
So what should that look like now?
anonymous
  • anonymous
-4x = 0/5
kohai
  • kohai
Not quite -4x=0-5 Because you subtract 5 from both sides
anonymous
  • anonymous
oh that part is kinda confusing
anonymous
  • anonymous
since u cant really subtract 0 - 5
kohai
  • kohai
It just creates -5
anonymous
  • anonymous
oh ok! now i get that
kohai
  • kohai
Okay so you should have -4x=-5 How do you get x by itself here?
anonymous
  • anonymous
divide by -4
kohai
  • kohai
Yes! So what is x?
anonymous
  • anonymous
x = -5/-4
kohai
  • kohai
And what does that simplify to?
anonymous
  • anonymous
-1 1/4
anonymous
  • anonymous
or wait just 1 and 1/4
kohai
  • kohai
Well, yeah. I meant that the negatives cancel, so it'll just be x=5/4
kohai
  • kohai
So for the y-axis, you set x equal to 0. what is that gonna look like?
anonymous
  • anonymous
oh ok! could you help me on another one? i really am having trouble with this
anonymous
  • anonymous
oh i thought that was the answer
anonymous
  • anonymous
oops
kohai
  • kohai
That's the x-intercept for the first equation
anonymous
  • anonymous
ohhhh! ok so then we have to find y
kohai
  • kohai
Yeah. So for the y-intercept, you set x equal to 0 4x + y = 5 4(0)+y=5 Start solving for y
anonymous
  • anonymous
0 + y = 5
anonymous
  • anonymous
then subtract 5 to both sides?
kohai
  • kohai
0+y will just by y, right?
anonymous
  • anonymous
yes
kohai
  • kohai
So it'll just be y=5?
anonymous
  • anonymous
since the zero isnt really there and 0 + 5 is y = 5?
kohai
  • kohai
Yup
anonymous
  • anonymous
thank you!! could you help me on another one? i really am having trouble with this
kohai
  • kohai
So that's it for the first one. I'll be back in a few mins. Start working on the second one, give it your best shot. It'll be the same way we just did. I'll check it when I get back
anonymous
  • anonymous
ok thanks :)
anonymous
  • anonymous
0 - y = 1 subtract 0? y = 1
anonymous
  • anonymous
x - y = 1(0) x - y = 0 so the answer would just be 0?
kohai
  • kohai
Lemme look at it
kohai
  • kohai
x-y=1 x-(0)=1
anonymous
  • anonymous
so thats the answer for x?
kohai
  • kohai
Mhm

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