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Dafna11 [192]
3 years ago
15

8. The length of a rectangular picture is 4 inches longer than three times the width. If the

Mathematics
1 answer:
Arada [10]3 years ago
6 0

Answer:

The dimensions of the picture are 8 inches and 20 inches

Step-by-step explanation:

<em>A rectangular picture has a length 4 inches longer than three times the width, so assume that the width of the rectangle is x.</em>

∵ The width of the rectangle = x inches

∵ Three times the width = 3 times x = 3x

∵ Four less than 3 times width = 3x - 4

∴ The length = 3x - 4 inches

<em>Perimeter (P) of a rectangle = 2 length + 2 width, then substitute the length and the width by their values above.</em>

∴ P = 2(x) + 2(3x - 4)

∵ P = 56 inches ⇒ given

∴ 56 = 2(x) + 2(3x - 4)

→ Simplify the right side

∵ 2(3x - 4) = 2(3x) - 2(4) = 6x - 8

∴ 56 = 2x + 6x - 8

→ Add the like terms in the right side

∴ 56 = (2x + 6x) - 8

∴ 56 = 8x - 8

→ Add 8 to both sides to move 8 from the right side to the left side

∴ 56 + 8 = 8x - 8 + 8

∴ 64 = 8x

→ Divide both sides by 8 to find x

∴ \frac{64}{8}=\frac{8x}{8}

∴ 8 = x

∵ x represents the width of the picture

∴ The width of the picture is 8 inches.

∵ 3x - 4 represents the length of the picture

∴ The length = 3(8) - 4 = 24 - 4 = 20

∴ The length of the picture is 20 inches.

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Step-by-step explanation:

To distribute, you can use something called FOIL.  It stands for First, Outer, Inner, Last.

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