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19. x=28°

<E = 67°

20. x= 9°

<L = 25°

Step-by-step explanation:

19. Supplementary means that the angles will add to make a straight line, or they will add to = 180

<L+<E = 180°

4x+1°+3x-17°=180°

7x-16°=180°

7x=196°

x=28°

Measure of Angle E

<E = 3x-17° = 3(28°)-17° = 67°

20. Vertical angles are congruent, or equal to each other.

<L = <E

2x+7° = 4x-11°

2x+18° = 4x

18° = 2x

9° = x

x = 9°

<L = 2x+7° = 2(9°)+7° = 18°+7° = 25°