Question

really need help with systems of equationss!!
2x-4y=12
3x-6y=21 (I need to find x and y)

Answer 1

Know how to do elimination or substitution?

Answer 2

2x – 4y = 12.....A
3x – 6y = 21.....B
from equation A find the value of x or y its up to your choice and then place it in equation B in this way you will get the answer of A and B

Answer 3

I know I need to find one value first but I do not know how to get that first value

Answer 4

that is exactly what I am learning but I dont quite get it

Answer 5

Well, with this one there is something you can do first that will help. Multiply the entire first equation by 1/2 and the 2nd by 1/3rd. You should see something significant then.

Answer 6

2x-4y=12 place x on one side and rest of values on other side lie this
2x=12+4y
x=12+4y/2
x=12/2+4y/2
x=6+2y .....in this way you get the value of x now put this value in second equationto get the value of y
like this
3x-6y=21
3(6+2y)-6y=21
18+8y-6y=21
8y-6y=21-18
2y=3
y=3/2
so in this way you get the value of y as well
x=6+2y
x=6+2(3/2)
x=6+3
x=9

Answer 7

THANK YOUU so muchhh!!!

Answer 8

welcome

Answer 9

Interesting idea, except it is wrong. That is not the answer.

Answer 10

You made your mistake here:
3(6+2y)-6y=21
18+8y-6y=21

Answer 11

oh one mistake

Answer 12

@epoweritheta is this right

Answer 13

Now, if you correct that, or do what I said at the start, or graph it, you will see something significant.

Answer 14

no solution right?

Answer 15

\(2x-4y=12 \)
\(3x-6y=21\)

\(\dfrac{1}{2}(2x-4y)=\dfrac{1}{2}(12) \)
\(\dfrac{1}{3}(3x-6y)=\dfrac{1}{3}(21)\)

\(x-2y=6\)
\(x-2y=7\)

See thee issue now? That means the same as saying \(6=7\).

Answer 16

Yes. They are parallel lines, so no solution:
https://www.desmos.com/calculator/8ikbblrbte

Answer 17

thank youu

Answer 18

could you help me with another one please?

Answer 19

Sure, just tag me when you open the new question.

Answer 20

great thankyouu!