Question

what is the solution of the following system
-2x-y=1
-4x-2y=-1

Answer 1

i got (3,8)

Answer 2

Multiply both sides of the first equation by 2 :-)

Answer 3

lets see if (3,8) is correct...
-2x - y = 1
-2(3) - 8 = 1
-6-8 = 1
- 14 = 1.....does that look true to you ?

Answer 4

so...do you prefer substitution or elimination ?

Answer 5

-2x - y = 1......-2x - 1 = y

so sub in -2x-1 in for y in the other equation....then solve for x

Answer 6

so no solutions?

Answer 7

-2x - y = 1

2(-2x - y) = 2(1)

-4x - 2y = 2

Answer 8

Does 2 = -1? :-)

Answer 9

no

Answer 10

Therefore the solution set of the system is empty.

Answer 11

Any questions?