Respuesta :

8x-10=3x+90. 8x-3x=90-10. 5x=80. x=16. So angle B is 3*16+90=138° :)
reynawolfie

Answer:

x= 20

<B= 150 degrees

Step-by-step explanation:

<A= 8x -10

<B= 3x +90

Since there are two parallel lines, if a transversal went through them, alternating angles are equal to each other. So <A= <B

8x -10= 3x +90

5x= 100

x= 20

<B= 3x +90

<B= 3(20) +90

<B= 60 +90

<B= 150 deg