X + 3 = 25
just subtract 3 from each side as this is an equation and what you do on one side must be done on the other
X + 3 - 3 = 25 - 3
X = 22
=======easy check
y is the variable
It is a linear equation in the variable a.
It is an equation in the single variable, s.
A linear equation in three variable.
It is a quadratic equation in the variable x.
y is the variable
No. In the variable x, alone, it is linear. In the variable y, alone, it is linear. But taken together, in x and y, you have a term which contains xy - that is, a term in which the powers of the unknowns add to 2. So the equation is not linear.
It is an equation in one variable.
It is a linear equation in the variable a.
It is an equation in one variable.
It is a linear equation in the variable z.
A linear equation in three variable.
It is an equation in the single variable, s.
It is a quadratic equation in the variable x.
It is either a linear equation in a variable ww or a quadratic equation in a variable w, (with ww denoting w2).
It is, in fact, an identity - which is an equation which is true for all values of the variable.
It is a linear equation in one variable.