Q: Do equations always have variables

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The idea is to work with the same variables, but it is possible that some of the variables are missing in some of the equations.

if you can, you could always search a online calculator and use that.

Straight line equations have two variables in the form of x and y

A system of equations is a set of two or more equations with the same variables, graphed in the same coordinate plane

No. There could be no solution - no values for x, y, and z so that the 3 equations are true.

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It is essentially a list of equations that have common unknown variables in all of them. For example, a+b-c=3 4a+b+c=1 a-2b-7c=-2 would be a system of equations. If there are the same number of equations and variables you can usually, but not always, find the solutions. Since there are 3 equations and 3 variables (a, b, and c) in this example one can usually find the value of those three variables.

The idea is to work with the same variables, but it is possible that some of the variables are missing in some of the equations.

if you can, you could always search a online calculator and use that.

There are many careers that use variables and equations regularly. Computer scientists, engineers, and scientists all depend on the use of variables and equations. Architects, plumbers, and home decorators also utilize variables and equations.

No, but eliminating variables is one of several ways to find the value of variables in a system of equations.

Simultaneous equations have at least two unknown variables.

Straight line equations have two variables in the form of x and y

A system of equations is a set of two or more equations with the same variables, graphed in the same coordinate plane

You need as many equations as you have variables.

No. There could be no solution - no values for x, y, and z so that the 3 equations are true.

An equation with two variables . . . seriously!An equation with one variable can be can be solved, but when there are two variables, you need two equations. This is called a system of two equations in two variables.Three equations in three variables, etc.

a system of equations