How would you graph y- 4x =8 ?

Y-4x=8

y=4x+8 (i added 4x to both sides)

for y intercept let x=0

y=4(0)+8

y=8

for x intercept let y=0

0=4x+8
4x=-8 (subtract 8 from both sides)
x=-2 (divided both sides by 4)

therefore draw up a x and y plane and put a dot on 8 on the y axis and a dot on -2 on the x axis and draw a straight line through both of these intercepts. 

Make the graph

Step-by-step explanation:

Make spaces and number them one to ten on the side

the number of students that play the instrument are how many spaces you shade for each section

i do not know how else i can be of help without making the graph for you, this is pretty simple maths.