Answer:
r = 11
Explanation:
so first, you would find the slope-int form of the equation.
This would be:
y-1= 3/4(x-7)
y= 3/4x - 17/4
Now you would substitute (r,4) into the equation:
4= 3/4r -17/4
So, to cancel out the fractions, you shall multiply everything by 4, this would give you:
16=3r-17
Now, solve for r
16=3r-17
33=3r
11=r