# Solving Problems Using Simultaneous Equations

Tags: Thesis And Library Research PaperCollege Level EssaysThesis Paper OutlinesCompare Business Cell Phone PlansNew Zealand Research PaperMit Thesis Online

Consider this example: Being that the first equation has the simplest coefficients (1, -1, and 1, for appears in the other two equations: Reducing these two equations to their simplest forms: So far, our efforts have reduced the system from three variables in three equations to two variables in two equations.

Now, we can apply the substitution technique again to the two equations of 2, 4, and 12, respectively, that satisfy all three equations.

What about an example where things aren’t so simple?

Consider the following equation set: We could add these two equations together—this being a completely valid algebraic operation—but it would not profit us in the goal of obtaining values for : The resulting equation still contains two unknown variables, just like the original equations do, and so we’re no further along in obtaining a solution.

The object is to manipulate the two equations so that, when combined, either the x term or the y term is eliminated (hence the name) − the resulting equation with just one unknown can then be solved: Here we will manipulate one of the equations so that when it is combined with the other equation either the x or y terms will drop out.

In this example the x term will drop out giving a solution for y.

The step-by-step example shows how to group like terms and then add or subtract to remove one of the unknowns, to leave one unknown to be solved.

It involves what it says − substitution − using one of the equations to get an expression of the form ‘y = …’ or ‘x = …’ and substituting this into the other equation.

If the total income earned be 0, find the amount invested in A and B separately A trader gains one third of the cost price as profit on a product and one fourth of the cost price as profit on other product. The sum of the cost prices of two products is 0.

If an equation has two unknowns, such as 2y x = 20, it cannot have unique solutions.

## Comments Solving Problems Using Simultaneous Equations

• ###### How to Solve Simultaneous Equations Graphically 8 Steps

There are a few ways to solve simultaneous equations; one of them is to plot the lines of the 2 equations, thus solving the equation. This article will teach you how to solve simultaneous equations graphically! Steps. 1. Write your 2 equations clearly. Write your 2 equations in an organised, clear way. This will make it easier later.…

• ###### Solving Simultaneous Equations and Matrices -

Solving Simultaneous Equations and Matrices The following represents a systematic investigation for the steps used to solve two simultaneous linear equations in two unknowns. The motivation for considering this relatively simple problem is to illustrate how matrix notation and algebra can be developed and used to consider problems such as…

• ###### Worksheet on Simultaneous Linear EquationsMethod of.

Solving simultaneous linear equations with two variabl. Worksheet on Simultaneous Linear Equations. Practice each pair of the equation problems from the worksheet on simultaneous linear equations with the two variables and two linear equations. Solving simultaneous linear equations with two variables by using the method of substitution to solve.…

• ###### Simultaneous Equations - Mathematics GCSE Revision

Simultaneous equations and linear equations, after studying this section, you will be able to. Solving simultaneous linear equations using straight line graphs. The 2 lines represent the equations '4x - 6y = -4' and '2x + 2y = 6'. There is only one point the two equations cross.…

• ###### Solving word problems using equations by Maths2Measure.

A worksheet with worked solutions. Students need to use a pronumeral to represent the unknown number They then need to write an equation and solve it to find the value of the unknown number. Australian Curriculum NSW MA4-8NA generalises numb.…

• ###### Solving Systems of Linear Equations Using Matrices

Solving Systems of Linear Equations Using Matrices Hi there! This page is only going to make sense when you know a little about Systems of Linear Equations and Matrices, so please go and learn about those if you don't know them already! The Example. One of the last examples on Systems of Linear Equations was this one…

• ###### Solving systems of equations by elimination video Khan.

Let's explore a few more methods for solving systems of equations. Let's say I have the equation, 3x plus 4y is equal to 2.5. And I have another equation, 5x minus 4y is equal to 25.5. And we want to find an x and y value that satisfies both of these equations.…

• ###### Solving Simultaneous Equations using Matrices solutions.

How to use matrices to solve simultaneous equations or systems of equations, How to use the inverse of a matrix to solve a system of equations, with examples and step by step solutions, how to solve a system of equations by using a matrix equation, 3x3 matrix equation example, 2x2 matrix equation example, solving 3 simultaneous equations using matrices…