Answer:
Value for y = 5
Step-by-step explanation:
Attachment being the diagram for this question.
From the diagram
Sum of angle in a triangle = 180°
75° + 3x° + (4y + 10)° = 180°
Since the triangle is an isosceles triangle and base angle of an isosceles triangle are equal
Therefore: 3x° = 75°
So
75° + 3x° + (4y + 10)° = 180°
75° + 75° + (4y + 10)° = 180°
150° + (4y + 10)° = 180°
(4y + 10)° = 180° - 150°
(4y + 10)° = 30°
4y = 30 - 10
4y = 20
Divide both side by 4
y = 20/4 = 5.
y = 5
