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HomeEQAO Grade 9 MathMathematicsSystems of Linear Equations in Two Variables › One rule of a system reads 2x + 6y = 10 and the …

One rule of a system reads 2x + 6y = 10 and the other reads x + 3y = 5. What kind of system is this?

ADependent, since one rule is twice the other
BInconsistent, since the lines never do meet
CIndependent, since they cross at one point
DIndependent, since the numbers are different
Answer & Solution
Correct answer: A. Dependent, since one rule is twice the other
1. Divide every term of the first rule by 2 to get x + 3y = 5. 2. That is exactly the second rule, so the two rules describe the same line. 3. Lines that lie on top of each other share every point, so there are infinitely many solutions. 4. A system like that is called dependent. 5. Option B would need the lines to be parallel but apart, which halving shows they are not. _Source: OpenStax College Algebra (CC BY 4.0), Ch 7 "Systems of Equations and Inequalities", section 7.1 Systems of Linear Equations: Two Variables_
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