Question

the figure shows an equilateral triangle with the sides as indicated. find the length of each side of the triangle (2x-7)cm (x+y-9)cm (y+5)cm​

Answer 1

Answer:

Step-by-step explanation:

all sides of a equilateral triangle are equal

2x + 7 = x + y - 9

x-y = -9-7

x-y = -16

x-y +16 = 0

so y+5 = x-y+16 = 0

so y = -5

so x+5+16 = 0

x = -21

so 2x+7 = -35

x+y-9 = -21-5-9

= -35

the other one will also be -35

Answer 2

Answer:

21

Step-by-step explanation:

all sides of an equilateral triangle are equal.

2x - 7= y + 5

2x - y= 5+7

2x - y = 12

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2x - 7 = x + y - 9

2x - x - y = -9 + 7

x - y = -2

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-(2x - y = 12)

x - y = -2 (using elimination method, y will become positive, and can be cancelled out)

-2x + x = -12 + -2

x = 14

hence, 2x - 7= 2(14) - 7 = 21