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2. 2P - 3Q = [ 8 6] - [ -6 -3]
[ 4 1] [ 3 15]
= [ 8+6 6+3]
[ 4-3 1-15]
= [ 14 9]
[ 1 -14]
3. -3x + 3 = -9 4y + x + 5 = 17
3x = 12 4y + 4 + 5 = 17
x = 12/3 4y + 9 = 17
x = 4 4y = 17 - 9
4y = 8
y = 8/4 = 2
Jadi, nilai x = 4 dan y = 2