In these equations, aand bare constants. If aminus bis 6, which of the following is true?

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In these equations, aand bare constants. If aminus bis 6, which of the following is true? <img alt='images' src='https://www.fatskills.com/images2/SAT/eq04548.png'/><!--<m:math display='block' overflow='scroll' xmlns:m='http://www.w3.org/1998/Math/MathML'><m:mtable columnalign='left'><m:mtr><m:mtd><m:mn>8</m:mn><m:mi>x</m:mi><m:mo>+</m:mo><m:mi>a</m:mi><m:mo>=</m:mo><m:mn>11</m:mn><m:mi>x</m:mi><m:mo>+</m:mo><m:mn>3</m:mn></m:mtd></m:mtr><m:mtr><m:mtd><m:mn>7</m:mn><m:mi>y</m:mi><m:mo>+</m:mo><m:mi>b</m:mi><m:mo>=</m:mo><m:mn>10</m:mn><m:mi>y</m:mi><m:mo>+</m:mo><m:mn>3</m:mn></m:mtd></m:mtr></m:mtable></m:math>-->