Question

-7x-2y=-13
x-2y=11

Solve for both x and y

I know how to do the problem so i just need to check my answer

Answer 1

so what's your answer?

Answer 2

Y= 4 and x= 19 what's your answer?

Answer 3

hmm i dont think this is right

Answer 4

if you substitute that to the first equation you'll have

-7(19) -2(4) = -13

i doubt this results in an equality

Answer 5

which method did you use? substitution or elimination?

Answer 6

I used substitution and plug it in to the second equation

Answer 7

okay let's try substitution

from equation 2:

x - 2y = 11

therefore

x = 11 + 2y

Answer 8

let's substitute this to the first equation

-7(11 + 2y) -2y = -13

what do you get here?

Answer 9

-77 -14y- 2y = 13

Answer 10

right..now combine like terms

Answer 11

16y= -13 +77 then add and divide so... Y= 4 like I said

Answer 12

hmm what did you do...

Answer 13

-77 - 14y - 2y = 13
-77 - 16y = 13
-77 - 13 = 16y

Answer 14

try now

Answer 15

lol..something's wrong here...wait a minute

Answer 16

-30=6y soo.. Y=5?

Answer 17

Ya the 13 is negative

Answer 18

ohhhh lol

-77 - 14y - 2y = -13
-77 - 16y = -13
-77 + 13 = 16y
-64 = 16y
-4 = y

that's what you did wrong

Answer 19

x=3 and y = -4

Answer 20

How did u get -4

Answer 21

-77 + 13 = -64

Answer 22

-64/16 = -4

Answer 23

x = 2y + 11
sub that into the first equation
-7( 2y +11 ) -2y = - 13
-14y -77 - 2y = -13
-16y =64
y = -4

Answer 24

do you get it now @azapata2 ?

Answer 25

y = -4
x +8 = 11
x = 11 - 8
x = 3

Answer 26

Ya thanks guys