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3p-2q=-18 || x2 = 6p-4q =-36
_________ _
19q=57
q=57/19
q=3
2p+5q=7
2p+5(3)=7
2p+15=7
2p=7-15
2p=-8
p=-8/2=-4
nilai dari 4p+3q adalah 4(-4)+3(3)
=-16+9
=-7
3p - 2q = -18 |x2| 6p - 4q = -36
dikurang sama yang atas hasilnya 19 q = 57
q= 57 : 19 = 3
2p + 5q =7 |x 2| 4p + 10q= 14
3p - 2q = -18 |x5| 15p - 10q= -90
ditambah sama yg atas hasilnya 19p = -76
p= -76 : 19 =-4
lalu sutitusikan p dan ki ke 4p + 3q = 4 (-4) + 3 (3) = -16 +9 = -7