Answer:
7
Step-by-step explanation:
The answer is y=-2x+3 (the last choice) because perpendicular lines mean the negative reciprocal of the original slope. (flip fraction and make it the opposite sign) and the y intercept stays the same
19. (X+5)-3
20. 2a
21.3b
22. 5y-5
23. 1/2n-15
