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41. jawabannya B, karena jika x = 3, maka y = -2.untuk pilihan yang lain, hasilnya akan menjadi pecahan
42.
2x - 3y = a
2(4) - 3(3) = a
a = -1
3x + y = -5a +b
3(4) + (3) = -5(-1) + b
10 = b
a + b = (-1) + 10 = 9
43.
keliling = 2(p + l)
28 = 2(p + p - 2)
14 = 2p - 2
2p = 16 ; p = 8 dan l = 6
Luas = p x l = 8 x 6 = 48
#maaf jika salah semoga membantu