4x - 2y + 7z² when x = 2, y = 5, and z = 8​

Step-by-step explanation:

Multiply 4 and 2 to get 8

Multiply 2 and 5 to get 10:-

Subtract 10 from 8 to get -2, and then calculate 8 to the power of 2 and get 64:-

Multiply 7 and 64 get 488:

Add -2 and 488 to get 446

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the direct variation says that:

then the equation is of the form is given by:

            where k is the constant variation.

from the given table:

consider any value of x and m(x)=y

x = 2 and m(x)=y = 3

substitute these value in [1]; we have;

divide both sides by 2 we get;

⇒

check:

put x = -1 and m(x) = -1.5

substitute in the equation:

-1.5 = -1.5                   true

therefore, the function m(x) represents a direct variation

graph of this function as shown below: