Q. Which value for the constant d makes y=7 an extraneous solution in the following equation?4y−3=d−yd=
Understanding extraneous solutions: Understand what an extraneous solution is. An extraneous solution is a solution that emerges from the process of solving an equation but is not a valid solution to the original equation. In this case, we want to find a value for d such that y=7 appears to be a solution after solving the equation but does not satisfy the original equation.
Substituting y=7 into the left side: Substitute y=7 into the left side of the equation.We substitute y=7 into the equation 4y−3 to see what value it produces.Calculation: 4×7−3=28−3=25=5
Substituting y=7 into the right side: Substitute y=7 into the right side of the equation.We substitute y=7 into the equation d−y to see what expression we get.Expression: d−7
Setting the expressions equal: Set the expressions from Step 2 and Step 3 equal to each other.Since we want y=7 to be an extraneous solution, the expressions from the left and right sides of the equation when y=7 is substituted should not be equal.Equation: 5=d−7
Solving for d: Solve for d.We solve the equation from Step 4 for d.Calculation: d=5+7=12
Verifying y=7 as an extraneous solution: Verify that y=7 is an extraneous solution for the found value of d. We substitute d=12 and y=7 back into the original equation to check if it holds true. Original equation: 4y−3=d−y Substitution: 4×7−3=12−7 Verification: 25=5=12−7=5 Since the equation does not hold true, y=7 is indeed an extraneous solution for d=12.