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{:[(6)/(5)p+kq=(4)/(5)],[q=(3)/(5)p-(2)/(5)]:}
Consider the system of equations, where 
k is a constant. For which value of 
k is there no 
(p,q) solutions?
Choose 1 answer:
(A) -2
(B) 0
(C) 2
(D) None of the above

{65p+kq=45 q=35p25\begin{cases} \frac{6}{5}p + kq = \frac{4}{5} \ q = \frac{3}{5}p - \frac{2}{5} \end{cases} Consider the system of equations, where kk is a constant. For which value of kk is there no (p,q)(p,q) solutions?\newlineChoose 11 answer:\newline(A) 2-2\newline(B) 00\newline(C) 22\newline(D) None of the above

Full solution

Q. {65p+kq=45 q=35p25\begin{cases} \frac{6}{5}p + kq = \frac{4}{5} \ q = \frac{3}{5}p - \frac{2}{5} \end{cases} Consider the system of equations, where kk is a constant. For which value of kk is there no (p,q)(p,q) solutions?\newlineChoose 11 answer:\newline(A) 2-2\newline(B) 00\newline(C) 22\newline(D) None of the above
  1. Write Equations: Write down the system of equations.\newlineWe have the following system of equations:\newline65p+kqamp;=45qamp;=35p25 \begin{align*} \frac{6}{5}p + kq &= \frac{4}{5} \\ q &= \frac{3}{5}p - \frac{2}{5} \end{align*} \newlineWe need to find the value of k for which there is no solution to this system.
  2. Substitute and Simplify: Substitute the second equation into the first equation.\newlineBy substituting the value of q from the second equation into the first equation, we get:\newline65p+k(35p25)=45 \frac{6}{5}p + k\left(\frac{3}{5}p - \frac{2}{5}\right) = \frac{4}{5}
  3. Distribute and Combine: Distribute k and combine like terms.\newlineDistribute k across the terms in the parentheses and then combine the p terms:\newline65p+3k5p2k5=45 \frac{6}{5}p + \frac{3k}{5}p - \frac{2k}{5} = \frac{4}{5} \newlineCombine the p terms:\newline(65+3k5)p2k5=45 \left(\frac{6}{5} + \frac{3k}{5}\right)p - \frac{2k}{5} = \frac{4}{5}
  4. Identify No Solution Condition: Identify the condition for no solution.\newlineFor there to be no solution, the p terms must cancel out, and we must be left with a false statement. This happens when the coefficient of p is zero, and the constant terms do not equal each other. So we need:\newline65+3k5=0 \frac{6}{5} + \frac{3k}{5} = 0
  5. Solve for k: Solve for k.\newlineSolve the above equation for k:\newline65+3k5=0 \frac{6}{5} + \frac{3k}{5} = 0 \newlineMultiply through by 55 to clear the denominators:\newline6+3k=0 6 + 3k = 0 \newlineSubtract 66 from both sides:\newline3k=6 3k = -6 \newlineDivide by 33:\newlinek=2 k = -2