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2. 2x+3+8=1 -3+2x-y=-15
2x+11= 1 -3+2(-5)-y=-15
2x=1-11 -3-10-y=-15
2x=-10 -13-y=-15
x=-5 -y=-15+13
-y=-2 => y=2
jadi 5x+4y= 5(-5)+4(2)=-25+8=-17
3. kepanjangan jadi di percepat
a. A+B=Ctranspose => hasilnya = P=1,75; Q=2.1; R=-5; dan S=-3
b. A-B=C => hasilnya = P=4; Q=3; R=-1; dan S=-6