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5x - 19 = 3x + 7
5x - 3x = 7 + 19
2x = 26
x = 26/2
x = 13
Diagonal AC = 5x - 19 = 5(13) - 19 = 65 - 19 = 46 cm
Diagonal BD = 3x + 7 = 3(13) + 7 = 39 + 7 = 46 cm
Jawaban bagian B
4x - 15 = x + 6
4x - x = 6 + 15
3x = 21
x = 21/3
x = 7
Sisi persegi AB = 4x - 15 = 4(7) - 15 = 28 - 15 = 13 cm
Sisi persegi BC = x + 6 = 7 + 6 = 13 cm