First, solve the equation C-200=500 for C:
C = 500 + 200C = 700
Next, solve the equation a•5 = 300 + 200 for a:
a•5 = 500a = 500 / 5a = 100
Finally, solve the equation 200•a = 900 - 500 for a:
200•a = 400100•200 = 400
First, solve the equation C-200=500 for C:
C = 500 + 200
C = 700
Next, solve the equation a•5 = 300 + 200 for a:
a•5 = 500
a = 500 / 5
a = 100
Finally, solve the equation 200•a = 900 - 500 for a:
200•a = 400
100•200 = 400