Starting from 3x − z ≤ 9 x = 0, substitute the value of x (i.e. x = 0) into the equation 3x − z ≤ 9 3(0) − z ≤ 9 z ≤ − 9 If z = 0 Then, 3x − 0 ≤ 9 3x ≤ 9 x ≤ 3 Intercept of x and z i.e (x,z) = (3, -9)