Question

Determine the value of x for which a || b if m∠1=60-2x and m∠5=70-4x

Answer 1

well first off, you already know that angle 1 and 5 are going to be the same measurment. so now you have to figure out what you could use as x that would make those equations equal. so lets use the first one
60-2x 
first, lets add 2x to both sides 
60=2x
now get x alone by dividing by 2
so 
30=x

Answer 2

Answer: the answer is 5

Step-by-step explanation: 60-2x= 70-4x

-2x=70-60-4x

-2x=10-4x

-2x+4x=10

2x=10

x=10/2

x= 5