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If 
3x+4y=7, which of the following expressions is equivalent to 
y ?
Choose 1 answer:
(A) 
-3x+7
(B) 
-(3)/(4)x+(7)/(4)
(C) 
(3)/(4)x+(7)/(4)
(D) 
3x+7

If 3x+4y=7 3 x+4 y=7 , which of the following expressions is equivalent to y y ?\newlineChoose 11 answer:\newline(A) 3x+7 -3 x+7 \newline(B) 34x+74 -\frac{3}{4} x+\frac{7}{4} \newline(C) 34x+74 \frac{3}{4} x+\frac{7}{4} \newline(D) 3x+7 3 x+7

Full solution

Q. If 3x+4y=7 3 x+4 y=7 , which of the following expressions is equivalent to y y ?\newlineChoose 11 answer:\newline(A) 3x+7 -3 x+7 \newline(B) 34x+74 -\frac{3}{4} x+\frac{7}{4} \newline(C) 34x+74 \frac{3}{4} x+\frac{7}{4} \newline(D) 3x+7 3 x+7
  1. Isolate variable y: Isolate the variable yy in the equation 3x+4y=73x + 4y = 7. To do this, we need to move the term involving xx to the other side of the equation by subtracting 3x3x from both sides. 3x+4y3x=73x3x + 4y - 3x = 7 - 3x This simplifies to: 4y=73x4y = 7 - 3x
  2. Divide sides by 44: Divide both sides of the equation by 44 to solve for yy.4y4=(73x)4\frac{4y}{4} = \frac{(7 - 3x)}{4}This simplifies to:y=(73x)4y = \frac{(7 - 3x)}{4}
  3. Simplify expression: Rewrite the expression in a more simplified form.\newliney=7434xy = \frac{7}{4} - \frac{3}{4}x\newlineThis is equivalent to:\newliney=34x+74y = -\frac{3}{4}x + \frac{7}{4}
  4. Match with answer choices: Match the simplified expression for yy with the given answer choices.\newlineThe expression y=34x+74y = -\frac{3}{4}x + \frac{7}{4} matches with choice (B) 34x+74-\frac{3}{4}x + \frac{7}{4}.

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