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{:[-6.4 x=4y+2.1],[ky+3.2 x=5.8]:}
For what value of 
k does the system of linear equations in the variables 
x and 
y have no solutions?

6.4xamp;=4y+2.1ky+3.2xamp;=5.8 \begin{aligned} -6.4 x & =4 y+2.1 \\ k y+3.2 x & =5.8 \end{aligned} \newlineFor what value of k k does the system of linear equations in the variables x x and y y have no solutions?

Full solution

Q. 6.4x=4y+2.1ky+3.2x=5.8 \begin{aligned} -6.4 x & =4 y+2.1 \\ k y+3.2 x & =5.8 \end{aligned} \newlineFor what value of k k does the system of linear equations in the variables x x and y y have no solutions?
  1. Conditions for no solutions: Understand the conditions for no solutions in a system of linear equations.\newlineA system of linear equations has no solutions when the lines represented by the equations are parallel. This means that the coefficients of xx and yy in both equations must be proportional, but the constants on the right side of the equations must not be proportional.
  2. Given system of equations: Write down the given system of equations.\newlineThe system of equations is:\newline6.4x=4y+2.1-6.4x = 4y + 2.1\newlineky+3.2x=5.8ky + 3.2x = 5.8
  3. Rearranging the equations: Rearrange the equations to have the same structure.\newlineWe want to express both equations in the form of y=mx+by = mx + b, where mm is the slope and bb is the y-intercept.\newlineFor the first equation:\newline4y=6.4x2.14y = -6.4x - 2.1\newliney=(6.44)x(2.14)y = (\frac{-6.4}{4})x - (\frac{2.1}{4})\newliney=1.6x0.525y = -1.6x - 0.525\newlineFor the second equation:\newlineky=3.2x+5.8ky = -3.2x + 5.8\newliney=(3.2k)x+(5.8k)y = (\frac{-3.2}{k})x + (\frac{5.8}{k})
  4. Comparing the slopes: Compare the slopes of the two equations.\newlineFor the lines to be parallel, the slopes of the two equations must be equal. The slope of the first equation is 1.6-1.6. The slope of the second equation is 3.2k\frac{-3.2}{k}.\newlineSo, we set 1.6-1.6 equal to 3.2k\frac{-3.2}{k}:\newline1.6=3.2k-1.6 = \frac{-3.2}{k}
  5. Solving for k: Solve for k.\newlineMultiply both sides by kk to get rid of the fraction:\newlinek(1.6)=3.2k(-1.6) = -3.2\newline1.6k=3.2-1.6k = -3.2\newlineNow, divide both sides by 1.6-1.6 to solve for k:\newlinek=3.21.6k = \frac{-3.2}{-1.6}\newlinek=2k = 2
  6. Checking if constants are proportional: Check if the constants are proportional.\newlineNow that we have found a value for kk, we need to check if the constants on the right side of the equations are proportional. If they are not, then the lines are parallel and there are no solutions.\newlineFor the first equation, the constant is 0.525-0.525.\newlineFor the second equation, the constant is 5.8k\frac{5.8}{k}, which is 5.82=2.9\frac{5.8}{2} = 2.9.\newlineSince 0.525-0.525 is not proportional to 2.92.9, the lines are parallel and there are no solutions.
  7. Final Answer: For k=2k = 2 the system of linear equations in the variables x x and y y have no solutions

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