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3x+2 = 8
x = 2
y + 6 = 2x + 11
y + 6 = 15
y = 9
.
2) M^T=
6 ...21....-2
3......0....17
16....4......1
-5.....8......13
.
3)
2x +y = 4.....kalikan 1
x - 3y = 9.....kalikan 2
..
2x + y = 4
2x - 6y = 18
kurangkan
7y = -14
y =-2
dan x - 3y = 9 ---> x = 9 +3y
x = 3