# How To Solve A Math Problem With 2 Variables

The easiest route here is to solve the second equation for This equation is full of those nasty fractions.We can simplify both equations by multiplying each separate one by it’s LCD, just like you can do when you are working with one equation.We will look at solving them three different ways: by graphing, by the substitution method, and by the elimination by addition method. In other words, it is where the two graphs intersect, what they have in common.

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That way when you go to solve for it, you won't have to divide by a number and run the risk of having to work with a fraction (yuck!! If you need a review on solving linear equations, feel free to go to Tutorial 14: Linear Equations in On Variable.

If your variable drops out and you have a FALSE statement, that means your answer is no solution.

If you do get one solution for your final answer, would the equations be dependent or independent? The graph below illustrates a system of two equations and two unknowns that has one solution: If you get no solution for your final answer, is this system consistent or inconsistent? If you get no solution for your final answer, would the equations be dependent or independent? The graph below illustrates a system of two equations and two unknowns that has no solution: If the two lines end up lying on top of each other, then there is an infinite number of solutions.

In this situation, they would end up being the same line, so any solution that would work in one equation is going to work in the other.

In this case you can write down either equation as the solution to indicate they are the same line. To remove fractions: since fractions are another way to write division, and the inverse of divide is to multiply, you remove fractions by multiplying both sides by the LCD of all of your fractions. If one of the equations is already solved for one of the variables, that is a quick and easy way to go.

If you need to solve for a variable, then try to pick one that has a 1 as a coefficient.Now let’s put (0, -1) into the first equation: If the two lines are parallel, then they never intersect, so there is no solution.If the two lines lie on top of each other, then they are the same line and you have an infinite number of solutions.So far, when I've asked you to solve an equation for a variable, it was pretty obvious which one I was talking about. That x is enjoying all the attention, like the only girl in an all-boys school.For example, to solve the equation 3x 2 = 23 , you'd solve for (isolate) the x variable. I need to add another skill to your equation-solving repertoire that will be extremely important in Graphing Linear Equations: how to solve for a variable when there's more than one variable in the equation.Example 4: Solve the equation -2(x - 1) 4y = 5 for y.Solution: Start by simplifying the left side of the equation. Since you're trying to isolate the y, eliminate every term not containing a y from the left side of the equation.If you do get one solution for your final answer, is this system consistent or inconsistent?If you said consistent, give yourself a pat on the back!If you get an infinite number of solutions for your final answer, is this system consistent or inconsistent? If you get an infinite number of solutions for your final answer, would the equations be dependent or independent? The graph below illustrates a system of two equations and two unknowns that has an infinite number of solutions: Here is the big question, is (3, 1) a solution to the given system?????Since it was a solution to BOTH equations in the system, then it is a solution to the overall system.

## Comments How To Solve A Math Problem With 2 Variables

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