Answer:
let y=length & x = width
thus 2×+2y=86
×y=450 > × = 450/y.
2(450/y) + 2y =86. substitute x for y
900/y + 2y=86. multiply the whole
equation by y
900+2y²=86y
2y²-86y+900=0. divide by 2
y² - 43y+450=0
(y-18) (y-25)=0
y=18 or 25
so the length is 25m & the width is 18m
hope it helps.
