Equations and expressions are both examples of algebra, the branch of math where letters stand in for numbers. These letters are called variables. An algebraic expression is a mathematical phrase that combines numbers, variables and operations. Here’s an example: 4b + 20. To turn that expression into an equation, add an equal sign (=) and a value on the other side: 4b + 20 = 100.help the answer is not 16.Which of these is an equation?
A
9x - 7
B
(b + 7) x 3
C
4x + 9 = 45
D
(â…”)x - 3 > c
