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1.5 a-4.5 b=3(a+b)

5.5 b=5(b-a)+2.5 a
If 
(a,b) is the solution to the system of equations, then what is the value of 
b-a ?

1.5a4.5bamp;=3(a+b)5.5bamp;=5(ba)+2.5a \begin{aligned} 1.5 a-4.5 b & =3(a+b) \\ 5.5 b & =5(b-a)+2.5 a \end{aligned} \newlineIf (a,b) (a, b) is the solution to the system of equations, then what is the value of ba b-a ?

Full solution

Q. 1.5a4.5b=3(a+b)5.5b=5(ba)+2.5a \begin{aligned} 1.5 a-4.5 b & =3(a+b) \\ 5.5 b & =5(b-a)+2.5 a \end{aligned} \newlineIf (a,b) (a, b) is the solution to the system of equations, then what is the value of ba b-a ?
  1. Write Equations: Write down the given system of equations.\newlineThe system of equations is:\newline1.5a4.5b=3(a+b)1.5a - 4.5b = 3(a + b)\newline5.5b=5(ba)+2.5a5.5b = 5(b-a) + 2.5a
  2. Simplify First Equation: Simplify the first equation.\newlineDistribute the 33 on the right side of the first equation:\newline1.5a4.5b=3a+3b1.5a - 4.5b = 3a + 3b\newlineNow, move all terms involving variables to one side to set the equation to zero:\newline1.5a4.5b3a3b=01.5a - 4.5b - 3a - 3b = 0\newlineCombine like terms:\newline1.5a7.5b=0-1.5a - 7.5b = 0
  3. Simplify Second Equation: Simplify the second equation.\newlineDistribute the 55 on the right side of the second equation:\newline5.5b=5b5a+2.5a5.5b = 5b - 5a + 2.5a\newlineCombine like terms:\newline5.5b=5b2.5a5.5b = 5b - 2.5a\newlineNow, move all terms involving variables to one side to set the equation to zero:\newline5.5b5b+2.5a=05.5b - 5b + 2.5a = 0\newlineCombine like terms:\newline0.5b+2.5a=00.5b + 2.5a = 0
  4. Solve System of Equations: Solve the simplified system of equations.\newlineWe now have the system:\newline1.5a7.5b=0-1.5a - 7.5b = 0\newline2.5a+0.5b=02.5a + 0.5b = 0\newlineMultiply the second equation by 1515 to make the coefficient of bb the same in both equations:\newline15(2.5a+0.5b)=15(0)15(2.5a + 0.5b) = 15(0)\newline37.5a+7.5b=037.5a + 7.5b = 0
  5. Eliminate bb: Add the two equations together to eliminate bb.
    1.5a7.5b=0-1.5a - 7.5b = 0
    37.5a+7.5b=037.5a + 7.5b = 0
    -----------------
    36a=036a = 0
    Divide both sides by 3636 to solve for aa:
    a=036a = \frac{0}{36}
    a=0a = 0
  6. Find a: Substitute the value of aa into one of the original simplified equations to find bb. Using the second simplified equation: 2.5a+0.5b=02.5a + 0.5b = 0 Substitute a=0a = 0: 2.5(0)+0.5b=02.5(0) + 0.5b = 0 0+0.5b=00 + 0.5b = 0 Divide both sides by 0.50.5 to solve for bb: b=00.5b = \frac{0}{0.5} b=0b = 0
  7. Find bb: Calculate bab - a.\newlineSince both aa and bb are 00:\newlineba=00b - a = 0 - 0\newlineba=0b - a = 0

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