# Suppose X is a discrete random variable and k is a constant. If E(3X+k)=26 and E(2k-X)=3 , what is E(X)?

##### 1 Answer

Jan 29, 2016

#### Explanation:

The calculation is nearly similar to substitution equation except for this time, you used density function as its equation.

For a discrete random variable

So, in order to find

Then, to solve for

From

Substitute