Question

solve this system of equations using the elemination method:
3x-2y=2
4x-7y=33

Answer 1

please show work

Answer 2

3x-2y = 2 .... (lets call this (e1) )
4x-7y = 33 .... (lets call this (e2) )
we need to eliminate one of the variables in order to find the other... elimination method... but we can't do that if the variable has different coefficients in both equations... so we can play with the numbers so that the coefficients evolve into becoming the same number... MAGIC! :P here's what i mean

lets say we want to eliminate the "x" variable... we have to make the coefficients of the "x" in both equations the same... here's how...

4(3x-2y) = 4(2) .......multiply the whole of equation 1 by 4 (lets call this (e3) )
3(4x-7y) = 3(33) .......multiply the whole of equation 2 by 3 (lets call this (e4) )

from (e3)
12x-8y = 8 ......... (e5)

from (e4)
12x-21y = 99 ....... (e6)


eliminating x (subtracting (e6) from (e5) )
12x - 8y = 8
12x - 21y = 99

0 +13y = -91
13y = -91
y = -91/13
y = -7


if y=-7 .... can you find x on your own?

Answer 3

no

Answer 4

so u mean he went thru all tht for nothing????????????????????

Answer 5

"MAGIC!" lol

Answer 6

awesome ;)

Answer 7

Nice work saso

Answer 8

substitute the value of y (which is -7) into one of the equations and solve for x

Answer 9

still lost sorry

Answer 10

where ever u see y in the first equation, put (-7), then solve for x

Answer 11

i'm still confused about the first equation

Answer 12

take it easy... relax, sit back and read through the solution i posted first, over and over... 2 times... then tell me if you're still lost :)

Answer 13

i keep getting the answer: -6.2

Answer 14

ok ummm
3x - 2y = 2
but y == -7
so
3x - 2(-7) = 2
3x - (-14) = 2
3x + 14 = 2
3x = 2-14
3x = -12
x = -12/3
x = -4

Answer 15

how did u solve it to get -6.2? i wanna know what u did... i might be able to tell where u went wrong...

Answer 16

ok

Answer 17

3x-2y=2
4x-7y=33
i did 4 times 3.. and made the top 12 negative
-12x-2=2
12x-7y=33
then for the top i did -12 time -2, and -12 times 2. i did the same thing for the bottom line, except different numbers.
24=-24
-84=396 ( the twelves canceled out)
then i had 24 and -84, and -24 with 396 and i got:
-60=372
then i divided those 2 numbers.
which gives me: -6.2
this is the way may teacher taught me. please help

Answer 18

o.o... so wrong... take a look at my explanation a couple of times... you'll get ur head around it, i don't even understand ur explanation but i'll look at it for a while, maybe i'll know what u were up to

Answer 19

lol

Answer 20

ok

Answer 21

4(3x-2y) = 4(2) .......multiply the whole of equation 1 by 4 (lets call this (e3) ) 3(4x-7y) = 3(33) .......multiply the whole of equation 2 by 3 (lets call this (e4) )

i don't understand this part

Answer 22

cus you explain this part to me?

Answer 23

can not cus