Current number of tickets required to sell weekly in order to hit capacity

Hello!

So I have created two widgets. One which shows how many tickets we are selling week on week for a given show. The other one shows currently how many tickets we need to be selling per week in order to hit capacity for that show. 

I would like to combine the two widgets into one graph with dual axis if possible? Columns which show the weekly number of tickets sold and then a line which shows the current weekly number of tickets we need to sell to hit capacity.

See the current 2 widgets below and the formula used to get the weekly number of ticket sales required to hit capacity. 

thanks!