I'm trying to remember how to

[michael.arnoldi@xxxxxxxx (MICHAEL J ARNkkkk)]

0.030x + 0.020y =0 (gamma neutrality)
0.180x + 0.150y =-10 (Vega risk)

0.030x=-0.020y
x=-0.020y/0.030 =-.667y

substitute x i (vega risk formula)
0.180(-.667y) + 0.150y=-10
-.120y + 0.150y=-10
0.03y=-10
y= -10/0.03 = - 333.33

now solve for x

0.030x= - 0.020y
0.030x=-0.020(-333.33)
x=-0.020(-333.33)/0.030
x=222.22

ok ?

good luck

mike