Question

Solve for X and Y: 3x / 5 + y/2 =13/10 and .5y+ .04x = 2.42 then evaluate xy.
a. xy=6
b. xy= -16
c. xy=30
d. xy= -10
e. none of these

Answer 1

@Preetha help please

Answer 2

@jigglypuff314

Answer 3

@Here_to_Help15 Thank you <3 you're the best.

Answer 4

anyone?? lol @cwrw238

Answer 5

thanks ^^

Answer 6

they dont seem to want to help :/

Answer 7

@sammixboo

Answer 8

@HelpBlahBlahBlah

Answer 9

@skullpatrol

Answer 10

come on _--_

Answer 11

i can help

Answer 12

then help her please

Answer 13

-_-

Answer 14

got it

multiply the first equation through by 10

multiply the second equation through by 100

you will get
6x + 5y = 13
50y + 4x = 242

follow so far?

Answer 15

sorry, a guy with a similar name told me to not just give out answers

Answer 16

i need to explain it seems

Answer 17

yes so far im following jigglypuff

Answer 18

so now you have to back substitute

Answer 19

or just multiply the 2 equations so that the x or y has the same coefficient

Answer 20

cool :)
then try doing elimination method...
multiply the first equation through by 2
and the second by 3

and get
12x + 10y = 26
12x + 150y = 726

Answer 21

then we can subtract like that
12x - 12x = 0
150y - 10y = 140y
726 - 26 = 700

so 140y = 700
solve for y

Answer 22

then once you get y
plug it back into an original equation...
then solve for x

Answer 23

okay let me do that and see what i get. hold on

Answer 24

so y=5

Answer 25

x=-2 ?

Answer 26

so -10 ?

Answer 27

yes :)
then xy = x*y = (-2)*(5) = -10
so correct! :)

Answer 28

thank you so much!!

Answer 29

you're welcome :) glad I could help ^_^