anonymous
  • anonymous
Find the solution(s) to the following system of equations: y = 5 y = 3x - 4 Write answer as an ordered pair(s). Separate by a comma if more than one solution. what is the x ordered pair
Mathematics
jamiebookeater
  • jamiebookeater
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DanJS
  • DanJS
If y = A and y = B, then set A = B, solve for the X value
DanJS
  • DanJS
5 = 3x - 4
anonymous
  • anonymous
I got -1 ?

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DanJS
  • DanJS
5 + 4 = 3x - 4 + 4 9 = 3x x = 3 y = 5 is already given
anonymous
  • anonymous
the answer that I have is 3,5 but it's wrong
DanJS
  • DanJS
the point (3,5) is where the two lines intersect
anonymous
  • anonymous
I got 239?
UsukiDoll
  • UsukiDoll
how is (3,5) wrong though? It does satisfy both equations
anonymous
  • anonymous
the y axis is right but the x axis isn't
DanJS
  • DanJS
are you trying to put this in a computer test
UsukiDoll
  • UsukiDoll
could be mymathlab stuff ?! that was horrible when I took Calculus II
DanJS
  • DanJS
you said you put 3,5 try (3,5)
anonymous
  • anonymous
I have in like that (3,5)
UsukiDoll
  • UsukiDoll
some sites are so super sensitive even though you have the right answer.
UsukiDoll
  • UsukiDoll
what site are you using @Aliypop ?
anonymous
  • anonymous
It's called Moodel
anonymous
  • anonymous
The y-coordinate is correct. Check the x again by graphing the system. thats the reply my teacher left
UsukiDoll
  • UsukiDoll
omg..... that means we have to use the graphing method
UsukiDoll
  • UsukiDoll
I would put a side note.... yo man solving for x helps too ...there's more than one method to solve a problem as long as it doesn't break math rules geez.
UsukiDoll
  • UsukiDoll
so I guess we have to graph y = 5 and y = 3x-4 -_-
anonymous
  • anonymous
okay
UsukiDoll
  • UsukiDoll
so y = 5 means that our x is set at 0 so draw a horizontal line at (0,5)
anonymous
  • anonymous
okay
UsukiDoll
  • UsukiDoll
and then for y = 3x-4 we have to let x be any number like x = 0,1,2,3 solve for y and plot points
anonymous
  • anonymous
ok
UsukiDoll
  • UsukiDoll
that's about it.. if x = 3 there should be intersection... honestly... more than one method works... wow.
UsukiDoll
  • UsukiDoll
I'm just peeved at what your teacher wrote like... dude come on
anonymous
  • anonymous
my teacher isn't the best I'm serious
UsukiDoll
  • UsukiDoll
yeah it already shows smh
anonymous
  • anonymous
this is just a summer school class and I'm almost done I'm ahead of the class and she go upset about it
UsukiDoll
  • UsukiDoll
LOL! XD
UsukiDoll
  • UsukiDoll
what was her reason to be upset at you though?
anonymous
  • anonymous
because 1 I was far ahead of the class , I came from a online home school so I'm usually ahead of my classes anyways
UsukiDoll
  • UsukiDoll
that's good.
UsukiDoll
  • UsukiDoll
getting ahead is the best thing ever...even I got blasted for being ahead in my computer classes but I just didn't care about what my professors said.
anonymous
  • anonymous
but i'm going to public high school they want me to finish on pace with the rest, also is the answer 0,5
UsukiDoll
  • UsukiDoll
hmmm... if we're going to use the graphing method we have to graph y = 5 which is a horizontal line. Since x isn't given, it's already 0. so we have a horizontal line at (0,5) then for y=3x-4 we let x = 0,1,2,3... and solve for y to get points. we then use that information to graph until we find the point of intersection with is (3,5)
UsukiDoll
  • UsukiDoll
it is supposed to be (3,5) that's the point of intersection.... but since it's the graphing method instead of substitution method then we graph 2 lines.
UsukiDoll
  • UsukiDoll
did you graph y = 5 and y = 3x-4 ?
anonymous
  • anonymous
I had gotten -2
UsukiDoll
  • UsukiDoll
oh were you solving for y =3x-4 by letting x = 0,1,2,3 ?
anonymous
  • anonymous
I got -3 with zero
UsukiDoll
  • UsukiDoll
wait... for y = 3x-4 (just focus on that equation...nevermind the y =5) if x = 0 then y = -4...so we have one point (0,-4)
UsukiDoll
  • UsukiDoll
|dw:1437396892108:dw|
UsukiDoll
  • UsukiDoll
I'll just graph y = 5 and we can solve y =3x-4 together so we got one point already which is (0,-4) |dw:1437396951979:dw|
anonymous
  • anonymous
so is it -4 ?
UsukiDoll
  • UsukiDoll
yeah for y = 3x-4 x = 0 plug that in to the equation and we have y = -4
UsukiDoll
  • UsukiDoll
now let's try x = 1 plug in x = 1 into y =3x-4 y =3(1)-4 can you solve further?
anonymous
  • anonymous
i got -1
UsukiDoll
  • UsukiDoll
good so when x = 1, y = -1 another point (1,-1)|dw:1437397160711:dw|
UsukiDoll
  • UsukiDoll
for y = 3x-4 let x = 2 so plugging x = 2 into the equation y =3x-4 we have y=3(2)-4 and our y is ?
anonymous
  • anonymous
2
UsukiDoll
  • UsukiDoll
yes so (2,2) another point |dw:1437397289276:dw|
UsukiDoll
  • UsukiDoll
and we already solved when x = 3 |dw:1437397314401:dw|
anonymous
  • anonymous
so it would be (-3,5)?
UsukiDoll
  • UsukiDoll
that drawing sucks by the way x( it should be (3,5) the point of intersection which is the solution to those 2 equations
UsukiDoll
  • UsukiDoll
anonymous
  • anonymous
so it's (0,5)
UsukiDoll
  • UsukiDoll
(0,5) for y = 5 yes. It's just a horizontal line
anonymous
  • anonymous
thank you for helping me :D
anonymous
  • anonymous
oh wait XD sorry I read something wrong
anonymous
  • anonymous
we're still solving for x right ?
UsukiDoll
  • UsukiDoll
I don't think so.. when we did y =3x-4 we let x be any number we choose until we find the point which draws the line further to intersecting the other line. In this case when our x =3, our y = 5 since we have a horizontal line y =5 that point (3,5) from y =3x-4 crossed the horizontal line y = 5
UsukiDoll
  • UsukiDoll
as soon as we reach a certain x value that produces a point of intersection, we're done. If we have perpendicular lines (two lines that intersect) that means that there is one solution. 2 parallel lines means no solution.
anonymous
  • anonymous
so it is (0,5) I know i asked that a couple times I just wanted to make sure
UsukiDoll
  • UsukiDoll
is that for graphing y = 5 only? then yes it's (0,5) on the x-axis it's 0.. so x = 0 and y = 5 at point (0,5) the horizontal line is drawn
anonymous
  • anonymous
okay
anonymous
  • anonymous
I have to submit the quiz so she can grade it yet again
UsukiDoll
  • UsukiDoll
good luck.
anonymous
  • anonymous
thank you
UsukiDoll
  • UsukiDoll
:)

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