# Write a system of equations with no solution or many solutions

It could be 7 or 10 orwhatever. For example, in The second equation is just two times the first equation, so they are actually equivalent and would both be equations of the same line. So any of these statements are going to be true for any x you pick. Well, then you have an infinite solutions.

The slope is not readily evident in the form we use for writing systems of equations. This is going to cancel minus 9x. Thus these equations are said to be inconsistent, and there is no solution. Because the two equations describe the same line, they have all their points in common; hence there are an infinite number of solutions to the system.

Number of solutions algebra Video transcript Determine the number of solutions for each of these equations, and they give us three equations right over here. When we talk about the solution of this system of equations, we mean the values of the variables that make both equations true at the same time.

So in this scenario right over here, we have no solutions. The calculator can then give you the coordinates of the intersection point. Maybe we could subtract.

If I just get something, that something is equal to itself, which is just going to be true no matter what x you pick, any x you pick, this would be true for. And you probably see where this is going.

Since two points determine one and only one line, we must conclude that if two lines intersect at two points, they must actually be the same line. Now if you go and you try to manipulate these equations in completely legitimate ways, but you end up with something crazy like 3 equals 5, then you have no solutions.

And now we can subtract 2x from both sides.

So we will get negative 7x plus 3 is equal to negative 7x. So we already are going into this scenario.

So for this equation right over here, we have an infinite number of solutions. In each case, how many such equations can you find? And if you just think about it reasonably, all of these equations are about finding an x that satisfies this. If you think about it you will see that the slope is the negative of the coefficient of x divided by the coefficient of y.

The bracket on the left indicates that the two equations are intended to be solved simultaneously, but it is not always used.

Because these are linear equations, their graphs will be straight lines. The only drawback to this method is that the solution is only an approximation, whereas the algebraic method gives the exact solution. Attempting to solve gives a false statement By attempting to solve such a system of equations algebraically, you are operating on a false assumptionâ€”namely that a solution exists.

Using a graphing calculator or a computeryou can graph the equations and actually see where they intersect. So this is one solution, just like that.

The Solutions of a System of Equations A system of equations refers to a number of equations with an equal number of variables. However, this is not possible. We will only look at the case of two linear equations in two unknowns.

Lines do not intersect Parallel Lines; have the same slope No solutions If two lines happen to have the same slope, but are not identically the same line, then they will never intersect.

Now you can divide both sides by negative 9. But if you could actually solve for a specific x, then you have one solution. So this system has infinitely many solutions, as the equations both correspond to the same line and lines have infinitely many points.When there is no solution the equations are called "inconsistent".

One or infinitely many solutions are called "consistent" Here is a diagram for 2 equations in 2 variables. So this system has infinitely many solutions, as the equations both correspond to the same line and lines have infinitely many points.

(Bonus) In parts (a), (c), and (d), there are infinitely many equations that can be found. A system of linear equations means two or more linear equations.(In plain speak: 'two or more lines') If these two linear equations intersect, that point of intersection is called the solution to the system of linear equations.

The Solutions of a System of Equations. A system of equations refers to a number of equations with an equal number of variables. We will only look at the case of two linear equations in two unknowns.

The situation gets much more complex as the number of unknowns increases, and larger systems are commonly attacked with the aid of a. If we end up with different numbers on either side of the equal sign, as in 4 = 5, then we have no solutions.

Learning Outcome. Review this lesson to learn how to determine if a mathematical equation has an infinite number of solutions or no solution. Then the equations are satisfied i.e. x+y=8 and -x-y= Add the equations to get 0=1. But this can't be true, so there is no solution pair to the system by contradiction.

Write a system of equations with no solution or many solutions
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