How would I solve this?
4x + y = 25
x - 3y = 16
None of the coefficients are the same so I dont know what to do?
Simultaneous Equations help! Watch
- 09-08-2016 19:06
- 09-08-2016 19:09
- 09-08-2016 19:11
Multiply one of the equations by a number to make one of the coefficients the same.
- 09-08-2016 19:29
rearrange one of them for y then substitute that in the other, to get a value for x, then substitute that value into one of the equations to get y
- 09-08-2016 23:25
- 10-08-2016 13:41
First equation becomes:
Second equation becomes
Equate the two equations and solve for x
If y=25-4x and y also equals (x-16)/3
Use the solution for x to solve for y
y=(-)3Last edited by Kendrik Lamar; 10-08-2016 at 13:45.
- 10-08-2016 13:53
Offline20ReputationRep:Community AssistantWelcome Squad
- Community Assistant
- Welcome Squad
- 10-08-2016 13:58
(Original post by RDKGames)
- 10-08-2016 14:01
I think multiplying the first by 3 and adding them would be faster than that
In any case, the important thing is multiplying is faster than subbing for y