P+Q = 96 P-Q = 66 Gimana persamaannya gan

P+Q = 96....(1)
P-Q = 66 ....(2)
p = 66+q

p+q = 96
(66+q) + q = 96
2q = 96 - 66
q = 30/2
q = 15

p-q = 66
p - 15 = 66
p = 66+15
p = 81

p+q=96
p-q=66

p=96-q
p-q=66

96-q-q=66
-2q= 66-96
-2q= -30
q= 15

p+q= 96
p+15=96
p= 96-15
p= 81
Hp= { p= 81 , q= 15 }