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The perimeter of a triangle is 7a - 11b. If two of its sides are 2a + b and a - 9b, what is the third side?

The perimeter of a triangle is 7a - 11b. If two of its sides are 2a + b and a - 9b, what is the third side?
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The perimeter of a triangle is 7a - 11b. If two of its sides are 2a + b and a - 9b, what is the third side?

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User Vladyslav Panchenko
by
7.7k points

2 Answers

1 vote

Answer:

4a-3b

Explanation:

This is 100% correct!!

Hope this Helps :)

answered
User GiantDuck
by
7.5k points
4 votes
P = 7a -11b

side _1 = 2a +b
side_2 = a -9b

side_3 = P -(side_1 +side_2)

side_3 = 7a -11b -(2a +b +a -9b) = 7a -11b -(3a -8b)

side_3 = 7a -11b -3a +8b = 4a -3b

side_3 = 4a -3b

hope helped
answered
User Hudon
by
8.7k points
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