Need Some more Math Help(new problems added)

Adam

I am sure this shit is easy for you guys but i suck at some of these problems.

Elimination Method
3x+4y=22
-5x+27=-2


The graphs of two linear equations that are dependent have how many points of intersection ?


Subsitution Method

x+2y = -7
2x+3y=-12


Graph
3x+y=5
2x-y=0

2x+y=4
4x+2y=1

Any help would be awesome.

WakeOfAshes

did you forget the y on teh second equation? should it be -5x+27y=-2?

WakeOfAshes

if you did write it correct... the second equation is a line and the first one is a parabola. Im pretty sure there will be two points of interection, however you should graph to make sure. They might not intersect at all.

WakeOfAshes

unfortunately I dont have the time to help you more today. Im sure someone else will have an ans for you.

Heisenberg

just get a graphing calculator and plug in the equations

Adam

Yeah i did forget the y haha.

monicaa

Ohhh I hated that shit

JLRedWing13

If only my engineering classes were this easy.....lol.

Adam

Thanks for the help . \m/

JLRedWing13

If only my engineering classes were this easy.....lol.

if only my current class was this easy. I can do this stuff all day with a smile on my face lol

Yeah no kidding. I actually have to do this stuff when I do problems in my structures class. The problem is that's by far the easiest shit we have to do when it comes to calculus and math lol.

Adam

I am way better at geometry then algebra.

JLRedWing13

Algebra comes more naturally to me than geometry, honestly.

JLRedWing13

Ew, matrices. It's really easy to fuck that shit up when the numbers get bigger.

Rex_Capone420

i did the math and the answer is 420

Adam

how about this problem

x over 2 + y over 4 = -1

x over 4 - y over 6 =3

Rex_Capone420

how about this problem

x over 2 + y over 4 = -1

x over 4 - y over 6 =3

this is also 420...weird huh

JLRedWing13

I can do that one......

Adam

Haha i hate fractions too. Here's some easy ones

3x+2y=-1
5x+6y=9

2x-3y=11
3y+5x=17

2x+y=5
4x-2y=14

slove by either elmination or subsitution

JLRedWing13

x over 2 + y over 4 = -1

x over 4 - y over 6 =3

----> 2x/4 + y/4 = -1
3x/12 - 2y/12 =3

-----> 2x + y = -4
3x - 2y = 36

------> 4x + 2y = -8
3x - 2y = 36

-----> 7x = 28 ------> x = 4 -----> 2(4) + y = -4 ----> y = -12

Rex_Capone420

x over 2 + y over 4 = -1

x over 4 - y over 6 =3

----> 2x/4 + y/4 = -1
3x/12 - 2y/12 =3

-----> 2x + y = -4
3x - 2y = 36

------> 4x + 2y = -8
3x - 2y = 36

-----> 7x = 28 ------> x = 4 -----> 2(4) + y = -4 ----> y = -12

Rex_Capone420

i haven't been in a math class in over 7 years