Question

CAN ANYONE HELP ME PLS I WILL FAN AND MEDAL TO ANYONE THT HELPS!

Answer 1

What is the solution to the following system?
3x+=3y=10
-9x-9y=-30

Answer 2

try posting up your working so far

Answer 3

I haven't got anything im stuck

Answer 4

okay so when you have questions like these, there are two methods you can go to;
substitution method
and elimination method
do you know how these work?

Answer 5

yes ofc

Answer 6

okay so pick whichever one you want to use for this particular question..

Answer 7

um.. substitution?

Answer 8

i tink de ansa is d :)

Answer 9

( ͡° ͜ʖ ͡°), ( ͠° ͟ʖ ͡°), ᕦ( ͡° ͜ʖ ͡°)ᕤ, ( ͡~ ͜ʖ ͡°). ( ͡o ͜ʖ ͡o), ͡° ͜ʖ ͡ -, ( ͡͡ ° ͜ ʖ ͡ °)

Answer 10

wheere's mey medal ?

Answer 11

de ansa us d

Answer 12

cun i huve my medul?

Answer 13

( ͡° ͜ʖ ͡°), ( ͠° ͟ʖ ͡°), ᕦ( ͡° ͜ʖ ͡°)ᕤ, ( ͡~ ͜ʖ ͡°). ( ͡o ͜ʖ ͡o), ͡° ͜ʖ ͡ -, ( ͡͡ ° ͜ ʖ ͡ °)

Answer 14

( ͡o ͜ʖ ͡o)

Answer 15

okay so if you want to substitute, write either one of the two equations in the form of y = ... or x = ....

Answer 16

but how?

Answer 17

okay so say we pick the first equation and want to write it in terms of x... so
3x + 3y = 10
we want to isolate x, do you have any ideas how we may do so?

Answer 18

plug in -9x...?

Answer 19

um no, we want x by itself, so we can start off by subtracting 3y from both sides of the equation, to get
3x + 3y - 3y = 10 - 3y and now we simplify..

Answer 20

so we get 3x = 10 - 3y

Answer 21

can it also be 3x=3y+10?

Answer 22

@FireKat97

Answer 23

no because we subtracted 3y from the right hand side, we didn't add it

Answer 24

because only through subtracting 3y from both sides, could we cancel 3y on the left hand side and try to isolate the x

Answer 25

so we divide 10-3y by 3x? @FireKat97

Answer 26

close.. we divide it by 3 alone :)

Answer 27

that way we get x = (10 - 3y)/3

Answer 28

\[x=\frac{ 10-3y }{ 3 }\]

Answer 29

@FireKat97

Answer 30

yup thats correct! Now we want to substitute this into our second equation and simplify..

Answer 31

\[-9(\frac{ 10-3y }{ 3 })-9y=-30\] so tht? @FireKat97

Answer 32

Yup! thats right! now we have to simplify

Answer 33

\[-9(\frac{10-3y }{ 3 })-9y=-30\]
\[-21y-9y=-30\]
\[+9y+9\]
-30=-30 @FireKat97

Answer 34

umm let start off by opening and simplifying the brackets first, so just simplify -9(10 - 3y( and tell me what you get

Answer 35

)*

Answer 36

-21 @FireKat97