Question

2x-y=3,9x-4y=15 how would i do this in the substition method

Answer 1

make y or x the subject in one eqn and substitute it in the other.
\[2x-y=3\] when y is made the subject \[y=2x-3\]Now substitute (2x-3) for y in the second eqn

Answer 2

not sure

Answer 3

y=9x-4

Answer 4

is that right

Answer 5

nope.. from 1st eq we got y = 2x - 3
correct?

Answer 6

yes

Answer 7

now if we make y the subject in the 2nd eq, we get
4y = 9x - 15
got it?

Answer 8

yes

Answer 9

now substitute the value we got for y frm 1 in 2. that is
4(2x-3) = 9x-15

Answer 10

got it? should i proceed or can u do it by urself?

Answer 11

no keep going or was that it

Answer 12

is there more to it

Answer 13

hello

Answer 14

sorry 4 da l8 amigo..
rest is quite simple.. just solve the final eqn we got to find x

4(2x-3) = 9x-15
8x-12 = 9x-15

get it now?

Answer 15

is the answer

Answer 16

x = 3
now u can subtitute this value in any of the initial eqns and find y..
get it?

Answer 17

is there more to it

Answer 18

u hav to find both x n y..
now we got x = 3
can u find y?

Answer 19

not sure how to do that

Answer 20

from 1st eq we got
y = 2x -3
Now we know x = 3
so what is y?

Answer 21

3

Answer 22

yep.. :D

Answer 23

so it s x=3 and y=3

Answer 24

yep bro..

Answer 25

thanks