x + y = 2.2

How do I solve this?

I need to solve for y

ok if u need to solve for y do u no whats x?

y = 2.2 - x

You cannot determine the numerical value for y unless you have a second independent equation, or know the numerical value of x.

No, I have no clue what either variable is.

ok thanks Drwis

To solve the equation x + y = 2.2, you can use a method called substitution. This involves isolating one variable in terms of the other, and then substituting that expression into the equation to find the value of the remaining variable.

1. Start by isolating one variable. Let's isolate x in terms of y.

Rearrange the equation to get:
x = 2.2 - y

2. Substitute this expression for x back into the original equation.

Replace x with (2.2 - y) in the equation x + y = 2.2:
(2.2 - y) + y = 2.2

3. Simplify the equation and solve for y.

Combine like terms by removing the parentheses:
2.2 - y + y = 2.2

The y terms cancel out, leaving:
2.2 = 2.2

Since the equation simplifies to a true statement, this means that there are infinitely many solutions for y.

4. Determine the value of x.

To find x, substitute any value for y into the expression x = 2.2 - y.

For example, let y = 1:
x = 2.2 - 1
x = 1.2

So, when y = 1, x = 1.2 is a solution to the equation.

Since there are infinitely many solutions for y, the solution to the equation x + y = 2.2 can be expressed as x = 2.2 - y, where y can take any real value and x will adjust accordingly.