Jawapan

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2016-09-23T23:02:53+08:00
∑ perimeter = 48cm
(x+5+x+5) + (7+y+7+y) = 48
2x+10+14+2y = 48
2x+2y+24 = 48
2x+2y = 24
x+y = 12
x = 12-y ----> 1

∑ luas = 78cm
5(x)+7(y) = 78
5x+7y = 78 -----> 2

Subtitute 1 into 2
5(12-y)+7y = 78
60-5y+7y = 78
2y = 18
y = 9cm  ------> 3

Subtitute 3 into 1
x = 12-y = 12-9 = 3cm
1 5 1
thanks . isn't this question using squareroot ?
2016-09-23T23:03:35+08:00
This is how i get the ans...u hv to form the eq n use simultaneuos to solve this ques...