13. Which of the following mathematical eqaution is a linear function? a.) f(x)=x2+2x-1 b.) f(x)=x2-3x+5 c.) f(x)=2 d.) f(x) = 3x+4
14. What is the slope of the line if the linear equation is: -y+3x=1? a.) -3 b.) 3 c.) 1 d.) -1
15. Which of the following statement states the difference between linear inequalities from linear equation in two variables? a.) Both linear equation and linear inequalities has two variables involved. b.) Only linear inequalities has values of x and y while linear equation does not have any variables. c.) Only linear inequalities needs to be shaded for the region that has the correct solution. d.) Only linear equation needs to be shaded for the region that has the correct solution.​