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How many solutions does the system have?

{[3x+y=8],[2x+2y=8]:}
Choose 1 answer:
(A) Exactly one solution
(B) No solutions
(C) Infinitely many solutions

How many solutions does the system have?\newline{3x+y=82x+2y=8 \left\{\begin{array}{l} 3 x+y=8 \\ 2 x+2 y=8 \end{array}\right. \newlineChoose 11 answer:\newline(A) Exactly one solution\newline(B) No solutions\newline(C) Infinitely many solutions

Full solution

Q. How many solutions does the system have?\newline{3x+y=82x+2y=8 \left\{\begin{array}{l} 3 x+y=8 \\ 2 x+2 y=8 \end{array}\right. \newlineChoose 11 answer:\newline(A) Exactly one solution\newline(B) No solutions\newline(C) Infinitely many solutions
  1. Write Equations: Write down the system of equations.\newlineWe have the following system of equations:\newline{3x+y=82x+2y=8 \begin{cases} 3x + y = 8 \\ 2x + 2y = 8 \end{cases}
  2. Simplify Second Equation: Attempt to simplify the second equation to see if it is a multiple of the first.\newlineDivide the second equation by 22 to simplify it:\newline2x+2y2=82 \frac{2x + 2y}{2} = \frac{8}{2} \newlineThis simplifies to:\newlinex+y=4 x + y = 4
  3. Compare Equations: Compare the simplified second equation with the first equation.\newlineWe now have:\newline{3x+y=8x+y=4 \begin{cases} 3x + y = 8 \\ x + y = 4 \end{cases} \newlineThese two equations are not multiples of each other, which means they are not the same line.
  4. Determine Intersection: Determine if the two equations intersect.\newlineSince the two equations are not the same line and they are both linear equations in two variables, they should intersect at exactly one point unless they are parallel.
  5. Check Slopes: Check the slopes of the two lines to determine if they are parallel.\newlineThe slope of the first equation 3x+y=83x + y = 8 is 3-3, and the slope of the second equation x+y=4x + y = 4 is 1-1. Since the slopes are different, the lines are not parallel.
  6. Conclude Solutions: Conclude the number of solutions.\newlineBecause the lines are not parallel and are not the same line, they will intersect at exactly one point. Therefore, the system of equations has exactly one solution.