It is a function, because it has the shape of an x^2 function.
A) multiply equation A by -2 so you get -2x - 2z = -12 and then you can add both equations to eliminate z
The answer would be y=15x
Step-by-step explanation:
if y is equal to 15 times x then y=15x
Answer:

Step-by-step explanation:
The constraints are
The red line represents the function

At 

At 

Two points are 
The blue line represents the function

at 

at 

Two points are 
The other two constraints are
,
. So, the point has to be in the first quadrant
From the graph it can be seen there are two points where the function will be maximum let us check them.




So, the maximum value of the function is
.
19 out come
9 for the first 3 questions
10 for the last 5 questions
Hope this helps ;)