Question

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Answer 1

Answer:

linear pair so...... a + b = 180............i

given that........... a - b = 80................ii

adding both equation......... 2a = 260

so.........a = 130

b = 50

Step-by-step explanation:

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Answer 2

Answer:

a=80+b.......(I) {substitute in 2}

a+b=180°.......(2)

80+b+b=180°

2b=180-80

b=100/2

b=50°{Put this value in eqn l}

a=80+50

a=130°