For what value of x is line a parallel to line b?
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The value of x that will make line a to be parallel to line b in the diagram given is: x = 30
Recall:
Corresponding angles are congruent to each other if the two lines they lie on that is cut by a transversal are parallel to each other.
Thus:
(2x + 20) and 80 are corresponding angles, and would be congruent to each other if lines a and b are parallel.
[tex]2x + 20 = 80[/tex]
[tex]2x + 20 - 20 = 80 - 20\\\\2x = 60\\[/tex]
x = 30
Therefore, the value of x that will make line a to be parallel to line b in the diagram given is: x = 30
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