Which of these strategies would eliminate a variable in the system of equations?{6x+5y=16x−5y=7Choose 2 answers:A Multiply the top equation by 7 , then subtract the bottom equation from the top equation.B Subtract the bottom equation from the top equation.CAdd the equations.
Q. Which of these strategies would eliminate a variable in the system of equations?{6x+5y=16x−5y=7Choose 2 answers:A Multiply the top equation by 7 , then subtract the bottom equation from the top equation.B Subtract the bottom equation from the top equation.CAdd the equations.
Analyze the system: Analyze the given system of equations to determine which strategies could eliminate a variable.The system of equations is:6x+5y=16x−5y=7We need to find strategies that will eliminate either 'x' or 'y'.
Evaluate option A: Evaluate option A: Multiply the top equation by 7, then subtract the bottom equation from the top equation.Multiplying the top equation by 7 gives us:42x+35y=7Now, if we subtract the bottom equation (6x−5y=7) from this new equation, we will not eliminate any variable because the coefficients of 'x' and 'y' in the new equation and the bottom equation are not opposites.
Evaluate option B: Evaluate option B: Subtract the bottom equation from the top equation.Subtracting the bottom equation from the top equation gives us:(6x+5y)−(6x−5y)=1−7This simplifies to:6x+5y−6x+5y=−6Which further simplifies to:10y=−6This strategy successfully eliminates the variable ′x′.
Evaluate option C: Evaluate option C: Add the equations.Adding the equations gives us:(6x+5y)+(6x−5y)=1+7This simplifies to:12x=8This strategy successfully eliminates the variable ′y′.
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