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70 = 2(5x+9) + 2(2x+5)
70 = 10x + 18 + 4x + 10
70 = 10x + 4x + 18 + 10
70 = 14x + 28
70 - 28 = 14x
42 = 14x
x = 42/14
x = 3
panjang = 5x + 9
panjang = 5 x 3 + 9 = 15 + 9 = 24 cm
lebar = 2x + 5
lebar = 2 x 3 + 5 = 6 +5 = 11 cm
jadi panjang dan lebarnya, secara berturut turut adalah 24 cm dan 11 cm
70 : 2(5x+9) + 2(2x+5)
70 : 10x+18 + 4x+10
70 : 10x+4x+18+10
70 : 14x+28
70-28 : 14x
42 : 14x
x : 42/14
x : 3
p: 5x+9
:5(3)+9
: 15+9
: 24 cm
l: 2x+5
: 2(3)+5
: 6+5
:11cm