I don't understand what you've done with S1... You should just multiply the equation by 2 and then subtract the second equation from the first...
To solve a system of 3 linear equations, a student splits it into 2 subsystems as follows:
SYSTEM 1
(1/2)x-5y=-20
x-(4/5)y=6
SYSTEM 2
(3/5)x-2y=-4
(1/2)x-5y=-20
Solve both sub systems. and state what your solution (if one exists) tells you about the original system of 3 linear equations.
I've tried solving the 1st one and the 2nd by using the elimination method..
S1=
(1/1/2)x-5.8=-14
=(1/1/2)x=-14+5.8
=(1/1/2)x=-8.2
im stuck from this point..how do i get rid of the 1/1/2 so it ll just be x.
S2=
(1/2)x-5y=-20
(3/5)x-2y=-4
===========
1/1/10=7y=-24
-7y=-25.1
y=-25.1/7
y=-3.5857
is this correct for system 2?
what will the solution tell me about the original system of 3 linear equations.?