Math Question

N

Not Bman

Guest
How would you solve this?


Solve each linear system.

a) x + y = -8
x - 2y = 7
 
The answer is 179,756:):):)
Can You tell that it's been 17 years since I last left school.



Heeter
 
why type of math is this? and are u trying to find what x= or what?
 
if both of those are in the same part of the question ie both as a) then I would say that you do it by simultaneous equations

x + y = -8 --> leave
x - 2y = 7 --> multiply by -1

x + y = -8
-x + 2y = -7

add these

3y = -15 --> y = -5

x + -5 = 8 --> x = -3
x - 2(-5) = 7 --> x = -3

x = -3
y = -5

both equations work, so yeah I think this is the right way to do it
 
Originally posted by Heeter
The answer is 179,756:):):)
Can You tell that it's been 17 years since I last left school.



Heeter

Since you last left school?? Why did you go back?
 
Originally posted by Heeter
The answer is 179,756:):):)
Can You tell that it's been 17 years since I last left school.



Heeter

18 year for me.....That's a long long time ago :eek:
 
to get that answer you use system of equations. which means multiplying by a certain number to get something in common so they cancel out!
 
Originally posted by almostfamous88
to get that answer you use system of equations. which means multiplying by a certain number to get something in common so they cancel out!

look at my post above, thats what I did
 
So + two apples and a banana still equals an orange –two apples and a banana then?

:) :) :)
 

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