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you have to find the x and y intercepts of the equation. i have no idea how to do that :(
Okay, firstly, do you know what an intercept is?
no i dont :( i dont understand it at all
|dw:1446746671602:dw| An intercept is where the line crosses the axis
So this one has one y-intercept and two x-intercepts right?
oh ok that makes sense. and oh it has 2?
Yeah because on the x-axis it crosses over twice
oh i think i understand that
So to find it using equations, To find the x-intercept, you set y=0 To find the y-intercept, you set x=0
oh yeah! i know that part, i wrote that down in my notes. its just hard especially since i do online school
I understand, I had to do it that way too
So I'll help you through the first one okay?
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?
when you solve for x do you just add 4x to both sides
To solve for x you want x on one side and a constant on another
So you want x by itself
oh so you would subtract 5 or 0
So what should that look like now?
-4x = 0/5
Not quite -4x=0-5 Because you subtract 5 from both sides
oh that part is kinda confusing
since u cant really subtract 0 - 5
It just creates -5
oh ok! now i get that
Okay so you should have -4x=-5 How do you get x by itself here?
divide by -4
Yes! So what is x?
x = -5/-4
And what does that simplify to?
or wait just 1 and 1/4
Well, yeah. I meant that the negatives cancel, so it'll just be x=5/4
So for the y-axis, you set x equal to 0. what is that gonna look like?
oh ok! could you help me on another one? i really am having trouble with this
oh i thought that was the answer
That's the x-intercept for the first equation
ohhhh! ok so then we have to find y
Yeah. So for the y-intercept, you set x equal to 0 4x + y = 5 4(0)+y=5 Start solving for y
0 + y = 5
then subtract 5 to both sides?
0+y will just by y, right?
So it'll just be y=5?
since the zero isnt really there and 0 + 5 is y = 5?
thank you!! could you help me on another one? i really am having trouble with this
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
ok thanks :)
0 - y = 1 subtract 0? y = 1
x - y = 1(0) x - y = 0 so the answer would just be 0?
Lemme look at it
so thats the answer for x?