Question

solve the system of equations below:
x-2y=3
2x-3y=9

Answer 1

Hello would u like some help in very good at math I'm in 7th grade and I'm Cecilia

Answer 2

@hartnn can u help me? :)

Answer 3

i suck at these lol

Answer 4

sure,
lets try elimination method

Answer 5

in the first equation you have x
while in the 2nd one you have 2x

Answer 6

so multiply entire 1st equation by 2
what do u get ?

Answer 7

\(2 [x-2y] = 2 \times 3 \\ ... \)

Answer 8

x=2y+3/2 ???

Answer 9

did you try to isolate x ?

Answer 10

that you need to do when you're using substitution method

Answer 11

if you're more comfortable with substitution mentod, we can take that up

Answer 12

i suck at math, so either way is going to be a challenge for me :(

Answer 13

in the last question, you used substitution method,
so in this one let us use elimination :)

Answer 14

so
multiply 2 throughout the equation x-2y =3

let me give you an example :
Multiplying 3 throughout 4x+9y =-2

3[4x+9y] = -2*3
so we get
12x +27y = - 6


similarly what will u get if you multiply x-2y =3
by 2

Answer 15

y=1/2x-3

Answer 16

?

Answer 17

ok, so you isolated y now :)
lets go with substitution method only!

yes, thats correct
\(y = (1/2)(x-3)\)
thats what you meant, right ?

Answer 18

ooops yea :)

Answer 19

now plug this 'y' in 2nd equation

Answer 20

\(2x - 3 (1/2) (x-3) = 9 \)

did you get that ? ^

Answer 21

i just replaced y by 1/2 (x-3)

Answer 22

so do i solve for x?

Answer 23

x=9?

Answer 24

(9,3)

Answer 25

yes, you solve for x
and
x=9
is absolutely correct! :D

Answer 26

yep, 9,3 :)

Answer 27

:D thank you!!!!!

Answer 28

welcome ^_^

Answer 29

am i a super saiyan god now?? :) @hartnn lol

Answer 30

lol, you'll become a god, if you could solve all math problems :P

Answer 31

ah poo that'll never happen haha

Answer 32

thats why i will forever just be bulma...

Answer 33

don't lose hope, with practice its possible :)

Answer 34

and you're a cuter version of bulma :)

Answer 35

:3

Answer 36

See your here too lol