Question 887435
add all x's xt 50
add all y's yt  3.2
add all x^2's xst 750
add all y^2's yst  41.22
add all x*y's xyt 109.5

b = (4*109.5 -(50*3.2)) / (4*750 - 50^2) = 0.556 = 0.56
a = (3.2 - 0.56*50) / 4
a = -6.15
So the linear regression equation is
y = 0.56x-6.15