Antonio has $15 to spend on a set of colored pencils for his art class. Which number line represents the amount that he can spend on the pencils

Which of the following lines is not parallel to the graph of y = 4x +7?

An automated water dispenser fills packets with one liter of water on average, with a standard deviation of 5 milliliter. the manual says that after a year of operation the dispenser should be tested to see if it needs recalibration. a year later a number of filled packets are set aside and measured separately. it is found that the average packet now contains about 0.995 liters. does the dispenser need calibration? explain your answer.

X+ y = 5 ; x - y =3 solve using linear combination