Question

Someone please help me with this.

Answer 1

Answer:

$19.perimeter \: of \: rectangle = 2(l + b) \\ = 2((7x + 1) + (x - 3)) \\ = 2(7x + 1 + x - 3) \\ = 2(8x - 2) \\ = 16x - 4 \\ 16x = 4 \\ x = \frac{4}{16} \\ x = \frac{1}{4}$

$20.perimeter \: of \: triangle = a + b + c \\ = 3y + y - 4 + 6y \\ = 10y - 4 \\ 10y = 4 \\ y= \frac{4}{10} \\ y = \frac{2}{5}$

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