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Do you know HOW? Use the given information to write an equation of Find the measure of the third angle of a triangle given each line. the measures of two angles. 14. slope -5, y-intercept -2 1. 57 and 101 15. slope , passes through (4, -1) 2. 72 and 72 16. passes through (1, 5) and (3, 11) 3. xand 20 Algebra Find the value of x for which e || m. Find m/1 and m/ 2. Justify each answer. 17. 18. 5. 85 (14x 5) m 2 (2x - 30) 13x 65 45 m 70 Graph each pair of lines. Tell whether they are parall 6. 7. perpendicular, or neither. 850 19. y = 4x + 7 and y= -4x -3 2 70% 20. y = 3x - 4 and y =3x + 1 21. y = x + 5 and y= -5x -1