How do you graph the solution set to a systems of linear inequalities in two variables and use it to solve real-world problems?

Which inequality is equivalent to -3x < -12? x < 4 , x < -4 , x > 4, x > -4

Which set of side lengths form a right side? a) 3ft,6ft,5ft b)50 in,48in,14in c)53m,48m,24m d)8cm,17cm,14cm

The scatter plot shows the number of animal cells clara examined in a laboratory in different months: plot ordered pairs 1, 20 and 2, 60 and 3,100 and 4, 140 and 5, 180 what is the approximate predicted number of animal cells clara examined in the 9th month?