College Algebra : Non Linear Systems

Example Questions

Example Question #1 : Non Linear Systems

Solve the following system of equations

There are no Real Solutions

Explanation:

First lets solve equation 2 for y.

Now we plug in  into equation 1.

FOIL the left hand side, simplify and then subtract  from each side.

Now use the quadratic equation in order to solve for .

, where  refer to the coefficients in the quadratic equation .

So the solutions for x are as follows

Now we just plug these values of x into equation 2 to solve for y.

So the solutions to these pair of equations are:

Example Question #1 : Non Linear Systems

Solve the system of equations to find the points where the graphs of the equations intersect.

,

,

,

,

,

,

Explanation:

Solve the system of equations,

(1)

(2)

Notice that we can multiply both sides of equation (2) by  to obtain,

(3)

Now equate equations (3) and (4) to obtain,

This is a quadratic equation, rearrange to find the roots by setting to zero and factoring,

Use these values to find the corresponding values of  by substituting into either of the original equations. Using equation (1),

The points  and  are the intersection points of the two functions,

Example Question #2 : Non Linear Systems

Solve the following system of equations:

Explanation:

Subtract the second equation from the first, to eliminate the y terms:

This yields the following:

Factor out an x from both terms:

Solve for x:

Plug in the values for x into the first equation:

Therefore, when , and when

Plug in the values for x and y to make sure they satisfy the second equation too:

Solution:

Example Question #1 : Non Linear Systems

Solve the following system of equations:

Explanation:

Substitute the value of x from the second equation, into the first equation:

Subtract y from both sides of the equation:

Use the quadratic formula to solve for y:

or

Plug the first value of y into the first equation:

Re-write the equation to make it easier to solve for x:

Add  to each side of the equation:

The second value of y into the first equation:

Re-write the equation to make it easier to solve for x:

Add  to each side of the equation:.

Plug the values of x and y into the second equation to make sure they satisfy both of them:

Solution:

Example Question #31 : Systems Of Equations

Solve the following system of equations:

Explanation:

Multiply the second equation by 6, to eliminate the denominator:

Simplify:

Plug the value of y, from the first equation, into the second equation:

Simplify:

Simplify further:

Use the quadratic formula to solve for x:

or

Plug the first value of x into the first equation:

Plug the second value of x into the first equation:

Plug the values of x and y into the second equation to make sure they satisfy both of them:

Solution:

Example Question #1 : Non Linear Systems

Solve the following system of equations:

Explanation:

Substitute the value of y from the second equation, into the first equation:

Subtract x from both sides of the equation:

Use the quadratic formula to solve for x:

or

Plug the first value of x into the second equation:

Plug the second value of x into the second equation:

or

Verify the first solution by plugging the first values of x and y into both equations:

Verify the second solution by plugging the second values of x and y into both equations:

Solution: