Answer:

B.  

=180degree - 110degree  [linear pair}

= 70degree

In triangle....

=70degree+40degree+ Y = 180degree {sum of triangle property}

=90degree +Y = 180degree

Y= {180-90}degree

Y= 90degree

Z = 40degree {Alt. interior angle}

X+Y+Z=180Degree

X+ 90 DEGREE+40 DEGREE=180 {linear pair}

X=180-130

X=50degree

Step-by-step explanation:

thx....

Answer:

b) l||m

40°=z(alternate interior angle)

110°=y+z(corresponding angles)

110°=y+40°

y=110°-40°=70°

40°+x+y=180°(supplementary angles)

40°+x+70°=180°

x=180°-110°=70°

c)y-80°=x(alternate interior angles)

y+x=180°(linear pair)

y+y-80°=180°

2y=180°+80°

2y=260°

y=260°/2=130°

y-80=x

130°-80°=x

50°=x

y-80°+z=180°(linear pair)

50°+z=180°

z=180°-50°=130°