Find an equation of the line. Write the equation in standard form. Through (6,3); Parallel to 8x-y=9

I’m stuck on this i don’t understand.

Idont get this question can someone me solve it? ** the distance light travels in one second (1 light second) is about 1.86 ×10^5 mi. saturn is about 475 light-seconds from the sun. about how many miles from the sun is saturn..my guess is 8.83* 10^7 you so much

Which of the fallowing best completes the sequence 5,10,15, a) 30 b) 22 c)25 d)35