Question

Plz help! Ill give medal and fan! but i really need help...
Solve the following system of equations:

-2x + y = 1
-4x + y = -1

Answer 1

A. (3, 1)
B. (-1, 3)
C. (-1, -3)
D. (1, 3)

Answer 2

@mathkid911 Plz help

Answer 3

@Bee_see can u help?

Answer 4

plug in the coordinates in each equation and see if they are equal

Answer 5

so for example if (3,1) was the right answer you would plug in 3 for x and 1 for y and calculate if the two equations would be the same

Answer 6

ohh ok let me check :)

Answer 7

Ok...You want to get rid of a variable. You can get rid of y by subtracting y-y, right? 1y-1y=0.

Answer 8

-2y-(-4x)=2x...
1-(-1)=2

Answer 9

yes

Answer 10

we are left with 2x=2....divide by 2. x=1

Answer 11

put any of the two equations. insert x.I chose the first one. so...

Answer 12

-2(1)+y=1

Answer 13

-2+y=1

Answer 14

add by 2...we get y=3.

Answer 15

ok so B and C are out right?

Answer 16

Check the variables! -2(1)+(3)=1 and -4(1)+3=-1

Answer 17

So is it D?

Answer 18

yes i got that part

Answer 19

D

Answer 20

@Bee_see is it D?

Answer 21

Yes. Do you understand how I got the answer?

Answer 22

yes thx for your help!

Answer 23

can u help me with one more?

Answer 24

Ok. Lets see if I can help.

Answer 25

Solve the system of equations by substitution. What is the solution for x?

2x + y = 1
4x + 2y = -1

Answer 26

x = 0
x = 2
There is no x value, as there is no solution.
x can be any value, as there is an infinite number of solutions.

Answer 27

Ok.Which variable do you want to eliminate?

Answer 28

idk

Answer 29

ok. Let me work on it then.

Answer 30

ok thx

Answer 31

infinite solutions

Answer 32

D? If so can u explain how u got it plz

Answer 33

@Bee_see r u there?

Answer 34

ah. sorry. no solution.

Answer 35

thx