Question

Solve the system using an equivalent system.
-2x - y = 0
3x - y = 10

Answer 1

Subtract one from the other to get rid of the y

Answer 2

subtract -2 and 3?

Answer 3

I mean subtract one equation (the whole thing) from the other one

Answer 4

ok so i did -2 - 0 which is -2
and i did 3 - 10 which is -7

Answer 5

did i do it right? these are my options (4, –2)
(–2, 4)
(2, –4)
(–4, 2)

Answer 6

-2x - y = 0 minus
3x - y = 10 equals
-----------

So -2x - 3x -y -(-y) = 0-10

Answer 7

i got -5

Answer 8

-2x-3x = ?

Answer 9

?Ç

Answer 10

1

Answer 11

Nyet!

-2x -3x = -5x

What about -y -(-y) ?

Answer 12

what are we putting as y?

Answer 13

We are not putting anything as anything at the moment.

All we are doing is subtracting one equation from the other one.

Answer 14

We are trying to get this -2x - 3x -y -(-y) = 0-10

So far we have got -2x -3x = -5x and the next bit is

-y - (-y) = ?

Answer 15

-5 or y?

Answer 16

-y - (-y) = -y +y = 0

Answer 17

So -2x - 3x -y -(-y) = 0-10 ->

-5x = -10 so what is x?

Answer 18

4?

Answer 19

-5x = -10 Put x = 4

Answer 20

ok so my answer is -2, and 4?