We can find this using the laws about angles and lines. One of these says that the sum of 2 angles on a straight line will always equal 180°. Therefore, we can just form the equation using the m∠IJE+m∠EJK=180. Once we find the value of x, we can substitute that in for the equation of m∠EJK.
m∠IJE+m∠EJK=180
60+31x-4=180
56+31x=180
-56 -56
31x=124
/31 /31
x=4
As we said earlier, we need to substitute the value of x in for the equation.
31x-4
31(4)-4
124-4
120
Using the logic above, we can see that the m∠EJK=120°.