Question

what is the value of x 1/5×-2/3y=30 when y=15

Answer 1

Equation.
1/5 x - 2/3 y = 30

     y= 15

Substitution.
1/5 x - 2/3 (15) = 30

1/5 x - 10 = 30

1/5 x = 30 + 10

1/5 x = 40

   x = 200.