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.
A linear equation in three variable.
It is an equation in the single variable, s.
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 an equation in one variable.
It is a linear equation in the variable a.
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 with a single variable, y.