Checking multiple values in an equation in MATLAB

For a given value of x, how could you use MATLAB to find what the smallest z value greater than 5 if z=x/y, and y values are considered in increments of 6 (6, 12, 18,...)?

Answer 1

[Walter Roberson]

z5min = min(z(z > 5))

Answer 2

[Torsten]

format long
x = 1271;
[y,z] = result(x)

y = 
   252

z = 
   5.045365079365079

function [y,z] = result(x)
  if x <= 30
    disp('Problem not solvable')
    y = [];
    z = [];
    return
  end
  if mod(x,30)==0
    y = x/5 - 6;
  else
    y = 6*floor(x/30);
  end
  z = x/y;
end