two sides of an equilateral triangle measure (y+10) and (y^2(-2)). if the perimeter of the triangle is 21 units what is the valu
e of y?
1 answer:
Answer:
y = -3
Step-by-step explanation:
Each side of an equilateral triangle will have a length that is 1/3 the perimeter. This triangle has sides of length 21/3 = 7, so ...
y + 10 = 7
y = 7 - 10
y = -3
This is consistent with the other given side measure ...
y^2 -2 = (-3)^2 -2 = 9 -2 = 7
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