I cant directly give u the answer but here is some help:
for part a add up and solve the equazions on the whiteboard.
for part b subtract 90 from what you got from part a.
Hope this helps. Sorry i couldnt help more.
Answer:
30r-18
Step-by-step explanation:
6*5=30
and
6*(-3)=-18
hope this helps
It is the first one Y = -5x + 1
apply this to any x you will get y
i just used trial and error