Question

What is the value for x? Enter your answer in the box. X=

Answer 1

this is an isoscele triangle, AB = BC, and the angle A is equal angle C.

8y - 7 = 73

8y = 73 + 7

8y = 80

y = 80 : 8

y = 10

------------------------

the sum of the interior angles is 180°

180 - 73 - 73 = 34° (angle B)

6x + 4 = 34

6x = 30

x = 30 : 6 =

x = 5

Answer 2

since this is an isosceles triangle, angle a =angle c

73 = 8y-7

add 7 to each side

80 = 8y

divide by 8

y =10

the sum of all three angles =180

<a +<b+<c = 180

73+6x+4 +73 = 180

add like terms

150 +6x = 180

subtract 150 from each side

6x = 30

divide by 6

x=5