Aclass of 40 students elected a class president. there were 12 votes for candidate a, and 18 votes for candidate b. the rest of the class did not vote. which expression gives the percent of voters who voted for candidate a?

The correct answer is %40. 
Since there are 30 voters, we are looking for the percentage of students that voted for Candidate A. using 12 out of 30.
To find the percentage, we must divide 12 by 30. 

Then, we multiply the quotient by 100.

Leaving us with our answer, %40.

The answer will be y=-5+0 because the slope is -5 and the it has to go through y-axis 0