Answer:

Step-by-step explanation:
<em>The given options are not in anyway related to the question. So, I will do away with them.</em>
Given


Required
Determine the linear relationship
Let
y represents the total cost
x represents the number of shirts
The relationship between x and y is:

This gives:


Answer:
9
Step-by-step explanation:
Area of kite is Area of triangles. Area is 6+3=9