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Parallel lines s and t are cut by a transversal, r, as shown.

Parallel lines s and t are cut by transversal r. Clockwise from top left, the angles formed by lines r and s are blank, (7 x minus 2) degrees, 1, blank; formed by lines r and t are blank, blank, blank, (6 x + 18) degrees.

What is the measure of angle 1?
20°
42°
138°
160°

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sqdancefan

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Answer:

  42°

Step-by-step explanation:

The angles marked with x-expressions are alternate interior angles, so are congruent.

  7x -2 = 6x +18

  x = 20 . . . . . . . . add 2-6x

  6x+18 = 6(20) +18 = 138

Angle 1 is supplementary to either of the x-expression angles, so is ...

  ∠1 = 180° -138°

  ∠1 = 42°

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Answer:

42

Step-by-step explanation:

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