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Q: To solve a system of equations you cannot replace a variable with an equal value or expression?

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The question is about an oxymoronic expression. A constant cannot be a variable and a variable cannot be a constant!

No, you can only simplify an expression. To solve for a variable, it must be in an equation.

10

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.

False X4

An expression cannot be solved; an equation or an inequality may be.

neither, an independent variable is a variable not being changed in the process of a science experiment. A variable in math cannot be described, only purpose of a variable is to take place of a number that you are trying to figure out in some equations. Others are equations with no solution.

There is, unfortunately, n equation in the question: only an expression. An expression cannot be solved for a variable.

You cannot because the expression still contains the unknown variable y.

You will apply them when solving quadratic equations in which the quadratic expression cannot be factorised.

You cannot work a simultaneous equation. You require a system of equations. How you solve them depends on their nature: two or more linear equations are relatively easy to solve by eliminating variables - one at a time and then substituting these values in the earlier equations. For systems of equations containing non-linear equations it is simpler to substitute for variable expression for one of the variables at the start and working towards the other variable(s).

It is an expression in the variable y. Since it is not an equation it cannot be solved.

False. [APEX]

7h - 2 - 51 is an expression NOT an equation. An expression cannot be solved for the value of a variable.

It is a linear expression with one variable, b. Since it is not an equation it cannot be solved.

This question cannot be answered. You will have to give me more detail.

You cannot solve a variable. You can solve an equation to find the value (or range of values) of a variable. How you do that depends on the nature of the equation that you have. Linear and quadratic equations are relatively simple, as are many trigonometric and exponential equations. But some cannot be solved in such a way and a numerical solution is required. Here you would make a guess and then improve on that guess and then improve on that until you were satisfied that you were close enough to the real answer.

A mathematical expression in its' most simplistic form, merely assigns a value to a variable. Don't confuse an expression with an equation. An equation requires a solution. An expression cannot be "solved". It only allows you to determine the value of a variable. This is the expression in words "x is equal to 3" (X is the variable which is equal to the constant number 3) This is the expression in numbers "x=3" The expression in words "y is equal to 6" (Y is the variable which is equal to the constant number 6) The expression in numbers is "y=6" I hope you understand now.

You cannot plug in a variable, what you do is plug in the value for a variable. If you know the value of the variable in an equation (or formula), the process of replacing that variable whenever it appears in the equation by its value is called plugging in the value for the variable.

It is a linear expression with one variable, b. Since it is not an equation it cannot be solved.

Equations cannot be ordered.

y - 7x is not an equation, it is an expression. An expression cannot have a slope.y - 7x is not an equation, it is an expression. An expression cannot have a slope.y - 7x is not an equation, it is an expression. An expression cannot have a slope.y - 7x is not an equation, it is an expression. An expression cannot have a slope.

It is an expression, in a variable x. Since it is not an equation, it cannot be solved.

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No, expressions do not have equal signs. Equations do, though. You can think of it like this: Equtions have EQUAl signs, while expressions do not.No, an expression cannot have an equal sign. If it were to have an equal sign, it would then be an equation.