Question

In the system: x + y = 10 and x - 2y = 8, Marie said that to eliminate x the first step would be to multiply the first equation by 2. Is she correct? If not, why not?

Answer 1

cause we have to eliminate x and it can b eliminated without multiplying by 2...
just subtract 2nd equation from the first one..

Answer 2

\[=>(x+y=10)-(x-2y=8) \]

Answer 3

\[=> 4y=2\]

Answer 4

so is she correct

Answer 5

sorry 3y=2

Answer 6

y=2/3...

Answer 7

wait shes wrong because you dont have to multiply right

Answer 8

now check did we multiply by 2 in frst step or not??? for eliminating x??

Answer 9

Shes right.

Answer 10

wait no

Answer 11

nope.. she z wrng

Answer 12

oh okay thanks

Answer 13

v jxt eliminate by subtraction.. rite??

Answer 14

(2x+2y=20) + (x -2y=8) =3x=28

Answer 15

you add since the second 2y is negative.