Humans have 46 chromosomes in 23 pairs which of the following descriptions of the cell types and chromosomes numbers is correct

For the following system, use the second equation to make a substitution for y in the first equation is 2x + ( 2x – 3 ) = 5

Solution:

Given, two equations are 2x + y = 5 ⇒ ( 1 )  

And y + 3 = 2x ⇒ ( 2 )

We have to find the solution of the given system of equations by substituting the y in second equation in the first equation.

Now, let us find the y value in the second equation

Then, eqn (2) ⇒ y + 3 = 2x

⇒ y = 2x – 3  

Now, substitute the y value in ( 1 )

Eqn ( 1 ) ⇒ 2x + ( 2x – 3 ) = 5

⇒ 2x + 2x – 3 = 5  

Thus we have used second equation to make a substitution for y in first equation

⇒ 4x = 5 + 3  

⇒ 4x = 8  

⇒ x = 2

Then, eqn 2 ⇒ y + 3 = 2(2)  

⇒ y + 3 = 4  

⇒ y = 1

Hence, the solution of the given system of equations is (2, 1).

By use the second equation to make a substitution for y in the first equation we get 2x + 2x – 3 = 5