Atextbook store sold a combined total of 377 physics and math textbooks in a week. the number of math textbooks sold was 85 less than the number of physics textbooks sold. how many textbooks of each type were sold?

Let the number of Physics textbooks

Then the number of Math textbooks sold


Their total equals 377


Solving the linear equation for x, we have


Adding 85 to both sides will result in



Divide by 2



Hence the Physics textbooks sold is 231.

To find the math textbook sold , substitute 231 into


This gives us,

Hence 146 math textbooks were sold

32.68 the is the !