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Common Core: 8th Grade Math Help » » Solve Systems of Two Linear Equations: CCSS.Math.Content.8.EE.C.8b
Example Question #1 : How To Find The Solution For A System Of Equations
Solve the system for and .
Possible Answers:
Correct answer:
Explanation:
The most simple method for solving systems of equations is to transform one of the equations so it allows for the canceling out of a variable. In this case, we can multiply by to get .
Then, we can add to this equation to yield , so .
We can plug that value into either of the original equations; for example, .
So, as well.
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Example Question #2 : How To Find The Solution For A System Of Equations
What is the solution to the following system of equations:
Possible Answers:
Correct answer:
Explanation:
By solving one equation for , and replacing in the other equation with that expression, you generate an equation of only 1 variable which can be readily solved.
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Example Question #1 : How To Find The Solution For A System Of Equations
Solve this system of equations for:
Possible Answers:
None of the other choices are correct.
Correct answer:
Explanation:
Multiply the bottom equation by 5, then add to the top equation:
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Example Question #2 : How To Find The Solution For A System Of Equations
Solve this system of equations for:
Possible Answers:
None of the other choices are correct.
Correct answer:
Explanation:
Multiply the top equation by:
Now add:
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Example Question #3 : How To Find The Solution For A System Of Equations
Solve this system of equations for :
Possible Answers:
None of the other choices are correct.
Correct answer:
Explanation:
Multiply the top equation by :
Now add:
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Example Question #4 : How To Find The Solution For A System Of Equations
Find the solution to the following system of equations.
Possible Answers:
Correct answer:
Explanation:
To solve this system of equations, use substitution. First, convert the second equation to isolate .
Then, substitute into the first equation for .
Combine terms and solve for .
Now that we know the value of , we can solve for using our previous substitution equation.
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Example Question #1 : How To Find The Solution For A System Of Equations
Find a solution for the following system of equations:
Possible Answers:
no solution
infinitely many solutions
Correct answer:
no solution
Explanation:
When we add the two equations, the and variables cancel leaving us with:
which means there is no solution for this system.
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Example Question #1 : Solve Systems Of Two Linear Equations: Ccss.Math.Content.8.Ee.C.8b
Solve the set of equations:
Possible Answers:
Correct answer:
Explanation:
Solve the first equation for :
Substitute into the second equation:
Multiply the entire equation by 2 to eliminate the fraction:
Using the value of , solve for :
Therefore, the solution is
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Example Question #281 : Equations / Inequalities
Solve the following system of equations:
Possible Answers:
Correct answer:
Explanation:
Set the two equations equal to one another:
2x - 2 = 3x + 6
Solve for x:
x = -8
Plug this value of x into either equation to solve for y. We'll use the top equation, but either will work.
y = 2 * (-8) - 2
y = -18
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Example Question #51 : How To Find The Solution For A System Of Equations
Solve this system of equations for :
Possible Answers:
None of the other choices are correct.
Correct answer:
Explanation:
Multiply the bottom equation by , then add to the top equation:
Divide both sides by
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