Elimination step by step for 2x+y=-2
x-2y=9

answer:

x = 1 and y = -4

Step-by-step explanation:

Multiply the second equation by -2, then add the equations together.

(2x+y=−2)

−2(x−2y=9)

Becomes:

2x+y=−2

−2x+4y=−18

Add these equations to eliminate x:

5y=−20

Then solve5y=−20for y:

5y=−20

5y

5

=

−20

5

(Divide both sides by 5)

y=−4

Now that we've found y let's plug it back in to solve for x.

Write down an original equation:

2x+y=−2

Substitute−4foryin2x+y=−2:

2x+−4=−2

2x−4+4=−2+4(Add 4 to both sides)

2x=2

2x          2

=

2             2

(Divide both sides by 2)

x=1

not enough information

step-by-step explanation:

we cannot know this, because the other students could have handed out 10 flyers, or they could have handed out 100. one way, the mean would go up, and another way, the mean would go down.