You have to give more explanation
3/4 changed to 6/8 makes it a 7/8 when adding making this most simplified into 7/8
4/15 is it's lowest terms. 2 is the lowest number that goes into both 8 and 30. It goes into 8 four times, and 30 15 times.
~Silver
6 I think because 6•3=18, 6•7=42, and 6•2=12
The y intercept is 9 and the unit rate is -7
So we plug these numbers in
y= -7x (the unit rate)+ 9 (y intercept)
y= -7x+9
