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Charles needs enough fencing to enclose a rectangular garden with a perimeter of 140 metres. If the width of his garden is to be 30 metres, write the equation that can be used to solve for the length of the garden.

Sagot :

perimeter= 2L + 2w
    where L is the length and w is the width
given the perimeter and the width, we can now calculate the length

140 m = 2L + 2 (30 m)
140 m = 2 L + 60 m

isolate the variable L to one side of the equation by transposing the constant to the other side. we get:

140 m - 60 m = 2L
80 m = 2L

divide both side by 2 to get L

40 m = L
Length is equal to 40 meters