Question 969411
This requires the point slope formula or just substituting.  

Let's do the point slope first
y-y1=m(x-x1)   y1 is the y value of the ordered pair  and x1 is the x value.  m is the slope

y-8=1.2(x-7)   Be careful with the signs.  If the y value were -8, the left side would be y- -8 or y+8

Now distribute  
y-8=(1.2*x) -8.4   (1.2*7)
add 8 to both sides
y=1.2x  -0.4   That is the equation of the line.

This way below may be easier.

y=mx +b
Plug is x,y, and m
8=1.2(7) +b
8=8.4  +b
subtract 8.4 from both sides

b=(-0.4)

y=1.2x - 0.4
This is the same answer and should serve as a check.  If you have two ordered pairs and they ask for the equation of the line, figure the slope and then use EITHER ordered pair to finish the job.  You will get the same result for each ordered pair, and you may use that to check.
Hope that helps.