Q. −6.4x=4y+2.1ky+3.2x=5.8For what value of k does the system of linear equations in the variable and y have no solutions?
Write Equations: First, let's write the system of linear equations in standard form:1) −6.4x−4y=2.12) 3.2x+ky=5.8
Check Parallel Lines: To find the value of k 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.
Find Slope Equation 1: The slope of a line in the form Ax+By=C is −BA. Let's find the slope of the first equation:slope of equation 1) = −(−6.4)/−4=46.4=1.6
Find Slope Equation 2: Now let's express the second equation in slope-intercept form to find its slope:3.2x+ky=5.8ky=−3.2x+5.8y=(−k3.2)x+k5.8The slope of equation 2 is −k3.2.
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:1.6=−k3.2
Solve for k: Now we solve for k:k=1.6−3.2k=−2
Verify Y-Intercepts: We have found the value of k. 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=−2 is rac{5.8}{-2}. Since these y-intercepts are different, our condition for no solutions is satisfied.