anonymous
  • anonymous
need help solve this equation using the elimination method 6x – 4y = 54 –9x + 2y = –69
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
ajprincess
  • ajprincess
Multiply the second equation by 2 nd can u plz tell me vat u get?
anonymous
  • anonymous
-18+4y=-138
ajprincess
  • ajprincess
yup good:) nw add this one with the first equation. terms with variable y will be elimnated. then solve for x. can u do it @yayasims21

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More answers

anonymous
  • anonymous
i cannt can u do it
ajprincess
  • ajprincess
plz give it a try. if u face any difficulty when doing it plz ask. I will help u:)
anonymous
  • anonymous
ok so im suppose to add -18+4y=-138 to 6x-4y=54
ajprincess
  • ajprincess
ya:)
anonymous
  • anonymous
i cant do it my calculator wont let me
ajprincess
  • ajprincess
-18x+4y+6x-4y=-138+54 (-18x+6x)+(4y-4y)=-138+54 See if u can do it nw:)
ajprincess
  • ajprincess
Add the ones inside the parentheses
anonymous
  • anonymous
i cant do it i really suck at math
ajprincess
  • ajprincess
what is -18x+6x?
anonymous
  • anonymous
-12
ajprincess
  • ajprincess
-12x. what is 4y-4y?
anonymous
  • anonymous
0
ajprincess
  • ajprincess
yup right:) what is -138+54
anonymous
  • anonymous
-84
ajprincess
  • ajprincess
yup good. nw combine these results.
anonymous
  • anonymous
add them
ajprincess
  • ajprincess
ya.
anonymous
  • anonymous
i get -96
TheViper
  • TheViper
@ajprincess happy new year & to @yayasims21 too :)
anonymous
  • anonymous
o thanks happy new year to u 2
TheViper
  • TheViper
:)
ajprincess
  • ajprincess
no. remember u can add -12x with -84. nd -84 is in the right side of the equal aign. -18x+6x+4y-4y=-138+54 -12x+0=-84 -12x=-84 Divide by -12 both sides to find x. Thanx @TheViper and I wish u the same:)
TheViper
  • TheViper
:)
anonymous
  • anonymous
-12 divided by -12 is 1 and -84 is 7
ajprincess
  • ajprincess
remember u r dividing -12x by -12 nt -12. this leaves u with x and u r right abt getting 7:)
ajprincess
  • ajprincess
So ur x becomes 7. To find y plug in this value in either 6x – 4y = 54 or –9x + 2y = –69 and solve
anonymous
  • anonymous
ok wat do u mean how am i suppose to do tht
ajprincess
  • ajprincess
x=7. Plug this in 6x-4y=54 6(7)-4y=54 42-4y=54 1.Subtract 42 both sides. 2.Divide by -4 both sides to find y.
anonymous
  • anonymous
i cant do this im so confused
ajprincess
  • ajprincess
42-4y=54 1.Subtract 42 both sides. 2.Divide by -4 both sides to find y.
ajprincess
  • ajprincess
Plz follow the steps
anonymous
  • anonymous
i am but so im suppose to subtract 42from -9
ajprincess
  • ajprincess
no. let me do one step and show. 42-4y=54 Subtract 42 both sides 42-42-4y=54-42 0-4y=12 -4y=12 Nw divide by -4 both sides to find y
anonymous
  • anonymous
-3x
ajprincess
  • ajprincess
-4y=12 Divide by -4 both sides (-4y)/-4=12/-4 y=-3
anonymous
  • anonymous
ok i got it is there anymore we have to do
ajprincess
  • ajprincess
nope. evrythng is done:)
anonymous
  • anonymous
ok well can u show this all at once so i can write it down
anonymous
  • anonymous
can you @ajprincess
ajprincess
  • ajprincess
Extremely sorrry @yayasims21. busy right nw.
anonymous
  • anonymous
o alright illtry to put it together
ajprincess
  • ajprincess
hav u finished @yayasims21?
ajprincess
  • ajprincess
\(6x-4y=54-(1)\) \(-9x+2y=-69-(2)\) (2)*2=>\(-18x+4y=-138-(3)\) (3)+(1)=>\(-18x+4y+6x-4y=-138+54\) \(-12x=-84\) \(-12x/-12=-84/-12\) \(x=7\) Substituting this in (1)=> \(6(7)-4y=54\) \(42-4y=54\) \(-4y=54-42\) \(-4y=12\) \(-4y/-4=12/-4\) \(y=-3\)

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