Systems of Equations
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Pre-Calculus › Systems of Equations
Solve the following system of linear equations:
Explanation
In order to solve a system of linear equations, we must start by solving one of the equations for a single variable:
We can now substitute this value for y into the other equation and solve for x:
Our last step is to plug this value of x into either equation to find y:
Solve the following system of linear equations:
Explanation
In order to solve a system of linear equations, we must start by solving one of the equations for a single variable:
We can now substitute this value for y into the other equation and solve for x:
Our last step is to plug this value of x into either equation to find y:
Solve the following system of equations for the intersection point in space:
Explanation
Because one of the variables, z, has already been isolated, let's use the substitution method to solve this system of equations. We know z = 1, so let's plug that into the middle equation to solve for y:
Now that we have found y, let's solve for x by plugging both y and z into the top equation:
Thus we have found that the point of intersection would be
Solve the following system of equations for the intersection point in space:
Explanation
Because one of the variables, z, has already been isolated, let's use the substitution method to solve this system of equations. We know z = 1, so let's plug that into the middle equation to solve for y:
Now that we have found y, let's solve for x by plugging both y and z into the top equation:
Thus we have found that the point of intersection would be
Solve the following system for :
Explanation
The first step is to solve the bottom equation for :
since our question specifies for
we just focus on
We now substitute this equation into the top equation:
we can now plug in our x-values into the bottom equation to find our y-values:
The solutions are then:
Solve the following system for :
Explanation
The first step is to solve the bottom equation for :
since our question specifies for
we just focus on
We now substitute this equation into the top equation:
we can now plug in our x-values into the bottom equation to find our y-values:
The solutions are then:
Solve the following system of linear equations:
Explanation
In order to solve a system of linear equations, we can either solve one equation for one of the variables, and then substitute its value into the other equation, or we can solve both equations for the same variable so that we can set them equal to each other. Let's solve both equations for y so that we can set them equal to each other:
Now we just plug our value for x back into either equation to find y:
So the solution to the system is the point:
Solve the following system:
Explanation
We can solve this system using either substitution or elimination. We'll eliminate them here.
Note: If you wanted to do substitution, we can do it by substituting the top equation into the bottom for .
We'll rearrange the bottom equation to have both y-values aligned and then add the equations:
_____________________
Now that we have our x-value, we can find our y-value:
Our answer is then
Solve the following system of linear equations:
Explanation
In order to solve a system of linear equations, we can either solve one equation for one of the variables, and then substitute its value into the other equation, or we can solve both equations for the same variable so that we can set them equal to each other. Let's solve both equations for y so that we can set them equal to each other:
Now we just plug our value for x back into either equation to find y:
So the solution to the system is the point:
Solve the following system:
Explanation
We can solve this system using either substitution or elimination. We'll eliminate them here.
Note: If you wanted to do substitution, we can do it by substituting the top equation into the bottom for .
We'll rearrange the bottom equation to have both y-values aligned and then add the equations:
_____________________
Now that we have our x-value, we can find our y-value:
Our answer is then