Question

3. The measures of two of the sides of an equilateral triangle are 3x + 15 in. and 7x – 5 in. What is the measure of the third side in inches? (1 point)
5
1
18
30

Answer 1

3x + 15 = 7x - 5
15 = 4x - 5
20 = 4x
x = 5

Answer 2

3(5) + 15 = ?

Answer 3

30?

Answer 4

yes

Answer 5

so thats my answer?:)

Answer 6

yes

Answer 7

Thanks !

Answer 8

since its an equilateral triangle, and all the sides of an equilateral triangle are equal, then you equate the two given sides to each other to find for x and substitute it in any of the given equations just as my friend has done