Answer:
-3x-3y-z=38
Step-by-step explanation:
To find the equation of the tangent plane you can use

the point P is (-6,-6,-2). Hence you have

hope this helps!!
For this case we propose a system of equations.
We know that a dime equals 10 cents and a nickel equals 5 cents.
So:
x: Let the variable that represents the number of dimes
y: Let the variable that represents the number of nickels
According to the statement we have:

We multiply the first equation by -0.10:

We have the following equivalent system:

We add the equations:

So, Jeff has 3 nickels

Jeff has 12 dimes.
Answer:
12 dimes and 3 nickels
The answer is c because the a and b work together to combined a like for