Can someone help me with the questions in the picture?

Y = mx + c

13. y = 2x - 4 and goes through (1,5)

Parallel

m = 2

(The slope is the same for parallel lines)

y = 2x + c
5 = 2(1) + c
5 = 2 + c
c = 3

y = 2x + 3

Perpendicular

m = - 1/2

(The slope is the inverse and negative for perpendicular lines)

y = -1/2x + c
5 = -1/2(1) + c
5 = -1/2 + c
c = -5.5

y = 1/2x - 5.5

Try the same thing for the second question

Your should get

Parallel: y = -3x + 12
Perpendicular: y = 1/3x + 2

Sub to pewdiepie he needs to stay #1