Equations are made from expressions.
equations
10
Expression. Equations have equals signs.
7
Linear equations are a small minority of functions.
equations
10
Expression. Equations have equals signs.
7
Linear equations are a small minority of functions.
formula expression
It is a linear expression in two variables. As an expression it cannot be solved. Furthermore, to solve equations in two variables you need at least two linear equations.
To solve the expression (12x - 5y - 20) using systems of equations with substitution, you would first need to have a system of equations that includes variables (x) and (y). You can solve one of the equations for one variable in terms of the other, then substitute that expression into (12x - 5y - 20). After substituting, you can simplify the expression to find its value based on the specific values of (x) and (y) from the original system of equations.
chemical equations
Numerical equations have only numbers and symbols, while algebraic equations have variables also.
A chemical equation is the graphic expression of a chemical reaction.
They both have variables.