Answer:
y=x+3
Explanation:
Start with the slope equation

Since the first point is actually further along the x-axis that x-value becomes
and its corresponding y-value is

=

The slope for the equation is just one so now find the y-intercept by rearranging the slope-intercept equation.
y=mx+b
y-mx=b
Now Substitute either point in to find b
9-1(6)=b
9-6=b
b=3
Your y-intercept is 3 so now we can write the slope-intercept equation for the two points:
y=x+3