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He bought 5 science books and 2 Math Books
5 Science Books = $300
2 Science Books = $100
7 Books = 400
Answer:
5 math books and 2 science books.
Step-by-step explanation:
Let's write a system of equations for this. m= math books and s= science books.
The first equation will be about the price.
60m+50s=400
The second will be about the amount he bought.
m+s=7
Let's solve by substitution.
m+s=7 can be rewritten as s=7-m.
Substitute s with 7-m.
60m+50(7-m)=400
60m+350-50m=400
10m+350=400
10m=50
m=5
Then we can plug it into the first equation.
5+s=7
s=2