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Verified answer
Jawab5)
a² + b² = 61
b = a+ 1
a² + (a + 1)² = 61
a² + a² + 2a + 1 = 61
2a² + 2a -60 = 0
a² + a - 30 = 0
(a +6)(a-5)=0
a = -6 atau a= 5 , dan a ,b bulat positip , maka a = 5
a + b = a + a + 1 = 2a + 1 = 2(5)+ 1= 11
6)
7)
x - y = 12 - 5 = 7
8)
1 + b = - 3
b = - 4
a +b+ 10 = 9
a +b = - 1
a = - 1 - b
a = - 1 - (-4)
a = 3