Every student in my school is in either French class or Spanish class, or both. Let x be the number of students in French class, y be the number of students in Spanish class, z and be the number of students who are in both classes. Find an expression in terms of x,y,z and for how many students there are in my school.
You can draw a venn diagram for this.
Since there are x Spanish students and y French students, there are x + y total students.
But since there are repeats that we counted twice, we subtract the repeating numbers so we only count it once.
\(x + y - z \) is your final answer.
i hope this helped,