book Maths Puzzle Numerical Ability

I need to find out (for economics) how to graph the following:
Px = (400/3) + (1/3)Qs
This is for supply and demand. Isn't it true that to graph you set p=0 then solve for q? And

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book Other Question
Angela and Laura found a great sale.
Angela bought one t-shirt and 4 pairs of shorts for $72.
Laura bought two t-shirts and 6 pairs of shorts for $114.
How much do the t-shir i have worked on this problem and have several different answerw

5sqrt96a^12b^8

i came up with 2a^2b^3 5sqrt24