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2p+2l = 50
2(3x+5) + 2(x+2) = 50
6x+10+2x+4 = 50
8x+14 = 50 -------> 8x = 50-14
8x = 36
x = 36/8 = 9/2
50= 2((3x+5) + (x+2))
25 = (3x+5) + (x+2)
25 = 3x+x+5+2
25 = 4x +7
25-7 = 4x
18 = 4x
4,5 = x
b. panjang = 3x+5 = 3.4,5 + 5
= 18,5
lebar = x+2 = 6,5
luasnya = 18,5. 6,5 = 120,25 cm²