Question

Hellow, need some help.

5) x+y+2=0
x-y+6=0
6)2x-y=1
3x+2y-5=0
7)y-3x+2=0
2x+3y=10
8)5y-x=4
4x+2y-1=0
9)2x+2y-6=0
4y+3x=1
10)3x-2y=2
2x+4y=8
Thanks! Maybe a few examples would help. Just giving the questions! I'm only in seventh grade :( and i haven't learn't this yet by the teacher and this was our set homework. THanks in general!

Answer 1

These are related to simultaneous equations :)

Answer 2

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Answer 3

5) x+y+2=0
x-y+6=0
So with these equations what you do is solve for one variable in one of the equations then plug that into the other equation. So I will do a example for you.
x = y - 6
y - 6 + y + 2 = 0
combine like terms
2y - 4 =0
solve for y
2y = 4
y=2

Now plug y=2 into either of the equations to find the value of x.
I will use equation x-y+6=0.

x -2 + 6 = 0
x =-4. So the answers will be x =-4 and y=2

You will do this for all your equations you posted on here.

Answer 4

^^ Thats probably not the question but it wasn't the correct asnwer. Can you do one for an example?

Answer 5

I did number 5.) for you already. Those should be the correct answer I double checked it. Is the homework asking you to fin y and x?

Answer 6

yes

Answer 7

i can tell you the answer what my tutor says

Answer 8

oh crap, i am so sorry :(. It is. i was reading the wrong question. Sorry for wasting your time D:

Answer 9

Its okay. It happens a lot.

Answer 10

7) y-3x+2=0
2x+3y=10.. I'm do one more for you. I'm doing number 7.

y-3x+2=0 ... lets solve for y so the equation will become y =3x - 2
Now substitute into 2x + 3y = 10
2x + 3(3x - 2) =10
2x + 9x -6 =10
11x = 16
x = 16/11

Now plug in x into either of these equations.
2(16/11) + 3y =10
32/11 + 3y = 10
3y = 78/11

y =78/33
So the answer is y = 78/33 and x =16/11

Answer 11

Oh hey again. I am really sorry but i don't get this 'topic' much! So if your x or y has a number.... what do you do? Like in the beginning?

Answer 12

You just isolate the variable like I did in the two examples.