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Test
Math
Domain
Algebra
Skill
Systems of two linear equations in two variables
Difficulty
Medium
ID: f5929f7a
Modded SAT Question Bank by Abdullah Mallik

y=-19x

y=12x

The solution to the given system of equations is x,y. What is the value of x?

  1. -9

  2. -7

  3. 0

  4. 2


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Correct Answer: C
Rationale

Choice C is correct. It's given by the first equation in the system that y=-19x. Substituting -19x for y in the second equation in the system yields -19x=12x. Multiplying the left-hand side of this equation by 22 and the right-hand side by 99 yields -218x=918x. Adding 218x to both sides of this equation yields 0=1118x. Multiplying both sides of this equation by 1811 yields x=0.

Choice A is incorrect and may result from conceptual or calculation errors. 

Choice B is incorrect and may result from conceptual or calculation errors. 

Choice D is incorrect and may result from conceptual or calculation errors. 

Question Difficulty: Medium
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