Determine if the equation is linear.
(1.) 2x + y=4

Answer : D

From the given graph,

x represents the ounces of salad dressing

y represents the total number of calories

From the graph , y intercept is 50

Now we find slope using any two points from the graph

Pick any two points

(0.5,100) (1.5,200)

slope = 100 that is 100 calories per ounce

y intercept = 50 that means 50 calories topped

So, answer is the total number of calories, y, in a salad with vegetables containing 50 calories topped with x ounces of salad dressing at 100 calories per ounce