Question

Anybody know anything about solving simultaneous equations by elimination?

Answer 1

@kelliegirl33

Answer 2

hello....what are your equations ?

Answer 3

This timei have no given knowledge of this

Answer 4

Is there an ipad view?

Answer 5

I can probably help. What are your equations, or are you just asking if I can explain how to do these problems ?

Answer 6

I do not know anything about an ipad view

Answer 7

Ok I'll say somehing about it to them later

Answer 8

do you have some equations ?

Answer 9

X plus Y equals -1 and 2+ Y equals -4

Answer 10

I graphed the line making them into Y equals -1 minus at & Y equals -4 minus 2X

Answer 11

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

We have to pick a variable to eliminate. It does not matter which variable. However, to eliminate a variable, one equation has to have positive and 1 has to have negative. For instance -2x and 2x will eliminate. However, sometimes you have to multiply an equation by something to make opposite variables.

x + y = -1
............oh...problem....is it supposed to 2x + y = -4 ??

Answer 12

josh...is it supposed to be 2x + y = -4 ??

Answer 13

Did you take Matt – U – C?

Answer 14

I am enjoying this :D

Answer 15

I don't know let me check.

Answer 16

if there is not an x in the second equation, it cannot be solved by elimination

Answer 17

X plus Y equals minus one is supposed to be positive, And -2x plus Y equals -4 is supposed to be negative

Answer 18

Sorry for the lack of Digital I'm using Siri it's much faster

Answer 19

x + y = -1 --->(2)
-2x + y = -4
----------------
2x + 2y = -2 (result of multiplying by 2)
-2x + y = -4
---------------add
3y = -6
y = -2
now sub -2 in for y in either of the original equations
x + y = -1
x + (-2) = -1
x - 2 = -1
x = 2 - 1
x = 1
check...
-2x + y = -4
-2(1) + (-2) = -4
-2 - 2 = -4
-4 = -4 (correct)

x = 1 and y = -2 or (1,-2)

ask any questions you might have and I will try my best to answer

Answer 20

Line 1 X plus Y equals -1 –>2?

Answer 21

I multiplied the entire equation by 2 to make the x's opposite so I could eliminate them. Does that make sense ?

Answer 22

Yes
I thought that with it but I wasn't sure

Answer 23

But what did you do with the first equation

Answer 24

and if you wanted to, you could have multiplied either of the equations by -1 to make the y's cancel out. It does not matter which variable you eliminate. It is best to try to find the one that is easiest.
The first equation : x + y = -1, I multiplied by 2 to make the x's cancel. The second equation I just left alone.

Answer 25

anymore questions, just ask :)

Answer 26

Oh okay I see it now

Answer 27

The correct answer iis ( -1, -1 )

Answer 28

Weight the estimated answer is -3,2. The answer is relatively four, -1.

Answer 29

Relatively was supposed to be correct

Answer 30

I'm so confused

Answer 31

@kelliegirl33

Answer 32

the correct answer is not (-1,-1), it is (1,-2)

Answer 33

Ok thanks

Answer 34

It didn't take nearly as long as it did last time

Answer 35

sometimes it takes a while and sometimes it doesn't....lol

Answer 36

Problem in line is in four in minus 2X plus Y my equals negative for why wouldn't it multiplied by two

Answer 37

@kelliegirl33

Answer 38

Because if you multiplied that equation by 2, the variables would not be opposite, and you could not cancel.

Answer 39

if you multiplied the 2nd equation by 2....it would not cancel out a variable