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{:[ay=2x+1],[y=2x+2]:}
Consider the system of equations, where 
a is a constant. For what value of 
a are there no 
(x,y) solutions?

ay=2x+1y=2x+2 \begin{array}{r} a y=2 x+1 \\ y=2 x+2 \end{array} \newlineConsider the system of equations, where a a is a constant. For what value of a a are there no (x,y) (x, y) solutions?

Full solution

Q. ay=2x+1y=2x+2 \begin{array}{r} a y=2 x+1 \\ y=2 x+2 \end{array} \newlineConsider the system of equations, where a a is a constant. For what value of a a are there no (x,y) (x, y) solutions?
  1. Identify Inconsistent Condition: The system of equations is given by ay=2x+1ay = 2x + 1 and y=2x+2y = 2x + 2. To find the value of aa for which there are no solutions, we need to look for a condition that would make the system inconsistent. This would occur if the two equations represent parallel lines, which means they have the same slope but different yy-intercepts.
  2. Convert Second Equation: The slope-intercept form of a line is y=mx+by = mx + b, where mm is the slope and bb is the y-intercept. The second equation is already in slope-intercept form with a slope of 22. To compare it with the first equation, we need to express the first equation in terms of yy.
  3. Express First Equation in y: To express the first equation in terms of y, we divide both sides by aa to get y=2ax+1ay = \frac{2}{a}x + \frac{1}{a}.
  4. Set Slopes Equal: Now we have y=2ax+1ay = \frac{2}{a}x + \frac{1}{a} and y=2x+2y = 2x + 2. For the lines to be parallel, the slopes must be equal, which means 2a\frac{2}{a} must be equal to 22. Setting these equal gives us 2a=2\frac{2}{a} = 2.
  5. Solve for aa: Solving for aa, we multiply both sides by aa to get 2=2a2 = 2a. Then we divide both sides by 22 to get a=1a = 1.
  6. Analyze Solutions: When a=1a = 1, the two equations have same slopes and different yy-intercepts, which means the system has no solution. \newlineTherefore, for a=1a = 1 there are no solutions for the given system of equations.

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