What is a coefficient? add an example. first answer will be brainliest.

is the number before and multiplied to a variable

3x

the 3 is the coefficient

4/7 fr

4/7 is the coefficient

x + 3 + 2x + 2 + x = 45

Step-by-step explanation:

Let the three numbers be x, y and z

If the sun of the three numbers is 45;

x+y+z = 45 ... (1)

If the second of the three numbers which is 'y' is three more than twice the first number 'x', this is expressed as:

y = 3+2x ... (2)

Also if the third number 'z' is two more than the first number 'x', this is expressed as:

z = 2+x ...(3)

To get the equation that can be used to solve for the first number 'x', we will substitute equation 2 and 3 into equation 1 to have;

x + (3+2x) + (2+x) = 45

= x + 3 + 2x + 2 + x = 45