Question

9. Find the two unknown angles in the figure.
2y
5y– 30°

Answer 1

Answer:

60 and 120

Step-by-step explanation:

2y+5y-30=180 (linear pair)

7y=180+30

7y=210

y=210÷7

y=30

1st angle =2y=2×30=60

2nd angle =5y-30=5×30-30=150-30=120

Answer 2

Answer:

60 degrees and 120 degrees

Step-by-step explanation:

straight line makes angle 180 degrees

so 2y+5y-30 = 180

7y-30=180

7y=180+30

7y=210

y=210/7

y=30

2y=2×30=60

5y-30=5×30-30=150-30=120

60 degrees and 120 degrees are the angle of above diagram