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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 variable and y have no solutions?

6.4x=4y+2.1-6.4 x=4 y+2.1\newlineky+3.2x=5.8k y+3.2 x=5.8\newlineFor what value of k k does the system of linear equations in the variable and y y have no solutions?

Full solution

Q. 6.4x=4y+2.1-6.4 x=4 y+2.1\newlineky+3.2x=5.8k y+3.2 x=5.8\newlineFor what value of k k does the system of linear equations in the variable and y y have no solutions?
  1. Write Equations: First, let's write the system of linear equations in standard form:\newline11) 6.4x4y=2.1-6.4x - 4y = 2.1\newline22) 3.2x+ky=5.83.2x + ky = 5.8
  2. Check Parallel Lines: To find the value of kk for which there are no solutions, we need to look for a condition where the two lines represented by the equations are parallel. Two lines are parallel if their slopes are equal.
  3. Find Slope Equation 11: The slope of a line in the form Ax+By=CAx + By = C is AB-\frac{A}{B}. Let's find the slope of the first equation:\newlineslope of equation 11) = (6.4)/4=6.44=1.6-(-6.4)/-4 = \frac{6.4}{4} = 1.6
  4. Find Slope Equation 22: Now let's express the second equation in slope-intercept form to find its slope:\newline3.2x+ky=5.83.2x + ky = 5.8\newlineky=3.2x+5.8ky = -3.2x + 5.8\newliney=(3.2k)x+5.8ky = \left(-\frac{3.2}{k}\right)x + \frac{5.8}{k}\newlineThe slope of equation 22 is 3.2k-\frac{3.2}{k}.
  5. Set Equal Slopes: For the system to have no solutions, the slopes of the two lines must be equal and their y-intercepts must be different. Therefore, we set the slopes equal to each other:\newline1.6=3.2k1.6 = -\frac{3.2}{k}
  6. Solve for k: Now we solve for k:\newlinek=3.21.6k = \frac{-3.2}{1.6}\newlinek=2k = -2
  7. Verify Y-Intercepts: We have found the value of kk. However, we must also ensure that the y-intercepts of the two lines are different for there to be no solutions. The y-intercept of the first equation is rac{2.1}{-4}, and the y-intercept of the second equation with k=2k = -2 is rac{5.8}{-2}. Since these y-intercepts are different, our condition for no solutions is satisfied.

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