Question

Solve the system of equations:
-2x-y=0
3x-y=10

Answer 1

Solve for y in the top equation

Answer 2

x = 2 & y = -4.

Answer 3

I solved using elimination, but there are 3 other ways.

Answer 4

Solve the following system:
{-2 x-y = 0 | (equation 1)
3 x-y = 10 | (equation 2)
Swap equation 1 with equation 2:
{3 x-y = 10 | (equation 1)
-(2 x)-y = 0 | (equation 2)
Add 2/3 × (equation 1) to equation 2:
{3 x-y = 10 | (equation 1)
0 x-(5 y)/3 = 20/3 | (equation 2)
Multiply equation 2 by 3/5:
{3 x-y = 10 | (equation 1)
0 x-y = 4 | (equation 2)
Multiply equation 2 by -1:
{3 x-y = 10 | (equation 1)
0 x+y = -4 | (equation 2)
Add equation 2 to equation 1:
{3 x+0 y = 6 | (equation 1)
0 x+y = -4 | (equation 2)
Divide equation 1 by 3:
{x+0 y = 2 | (equation 1)
0 x+y = -4 | (equation 2)

{x = 2
y = -4

Answer 5

Haha smartypants

Answer 6

I'm decent lml. (;

Answer 7

That's exactly what I got. Thanks so much!