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m*5+3=23
n*5-3=12
5m=20
5n=15
m=4
n=3
b)
m*5+n*(-3)=12
m*5-n*(-3)=18
5m-3n=12
5m+3n=18
5m=12+3n
12+3n+3n=18
6n=18-12
6n=6
n=1
m=(12+3)/5
m=3
c)
m*5+n*(-3)=-11
2*5m-3*(-3)n=8
5m-3n=-11
10m+9n=8
5m=-11+3n
2*(-11+3n)+9n=8
-22+6n+9n=8
15n=30
n=2
m=(-11+3*2)/5
m=(-11+6)/5
m=-5/5=-1
d)
m*5+n*(-3)=-39
m*5-n*(-3)=9
5m-3n=-39
5m+3n=9
5m=-39+3n
-39+3n+3n=9
6n=48
n=8
m=(-39+3*8)/5
m=(-39+24)/5
m=-15/5
m=-3