Question

What must be the value of x so that lines c and d are parallel lines cut by transversal p?

Answer 1

Because (3x+45)=99 degrees, X will equal 18 degrees

Answer 2

To be parallel (c//d) the internal angles with the secant p should be supplementary:

(3x +45) +81 = 180 ===> 3x+126 =180 ==>3x=54 & x= 18