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Question 9: Solve the equation and check your solution.

[tex]\[
\frac{7}{a+7} = \frac{6}{a+3}
\][/tex]

Select the correct choice below and, if necessary, fill in the answer box to complete your choice.

A. [tex]\( a = \square \)[/tex] (Simplify your answer.)

B. There is no solution.


Sagot :

Alright, let's solve the given equation step-by-step:

[tex]\[ \frac{7}{a+7} = \frac{6}{a+3} \][/tex]

1. Cross-Multiply to eliminate the fractions:

[tex]\[ 7(a + 3) = 6(a + 7) \][/tex]

2. Expand both sides:

[tex]\[ 7a + 21 = 6a + 42 \][/tex]

3. Isolate the variable 'a' by moving the terms involving 'a' to one side and constant terms to the other side. Subtract [tex]\(6a\)[/tex] from both sides:

[tex]\[ 7a - 6a + 21 = 42 \][/tex]

This simplifies to:

[tex]\[ a + 21 = 42 \][/tex]

4. Solve for 'a' by subtracting 21 from both sides:

[tex]\[ a = 42 - 21 \][/tex]

Simplifying the right-hand side:

[tex]\[ a = 21 \][/tex]

5. Check the solution to ensure it satisfies the original equation. Substitute [tex]\(a = 21\)[/tex] back into the original equation:

[tex]\[ \frac{7}{21 + 7} = \frac{6}{21 + 3} \][/tex]

Simplify both sides:

[tex]\[ \frac{7}{28} = \frac{6}{24} \][/tex]

Both fractions can be reduced:

[tex]\[ \frac{1}{4} = \frac{1}{4} \][/tex]

Since both sides are equal, the solution is correct.

Therefore, the correct choice is:

[tex]\[ \boxed{a = 21} \][/tex]