Solving for a variable

To 'solve for a variable' means to isolate the variable on one side of the equation to find its value.

Multiply both sides by 4 to isolate n: $$n = 13 \times 4 = 52$$ .

Divide both sides by 10: $$k = \frac{40}{10} = 4$$ .

Rearranging gives $$x = 13 - 2 = 11$$ .

It simplifies to $$4 = a$$ , so $$a = 4$$ .

Divide both sides by 9: $$x = \frac{-126}{9} = -14$$ .

An equation is a mathematical statement that asserts the equality of two expressions.

A variable is a symbol used to represent an unknown value in an equation.

It means there is no value for the variable that can satisfy the equation.

Isolating a variable involves using algebraic operations to get the variable alone on one side of the equation.