keliling persegi panjang : 2(p + l)
84 m = 2 (4x + 5) + (3x + 2)
84/2 = (4x + 5) + (3x + 2)
42 m = 7x + 7
42 - 7 = 7x
7x = 35
x = 35/7
x = 5
panjang = 4(5) + 5
= 25
lebar = 3(5) + 2
= 17
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keliling persegi panjang : 2(p + l)
84 m = 2 (4x + 5) + (3x + 2)
84/2 = (4x + 5) + (3x + 2)
42 m = 7x + 7
42 - 7 = 7x
7x = 35
x = 35/7
x = 5
panjang = 4(5) + 5
= 25
lebar = 3(5) + 2
= 17