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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 System Equations: Write down the system of equations.\newlineWe have the following system of equations:\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\newlineWe need to solve this system to find the values of aa and bb, and then calculate bab - a.
  2. Simplify First Equation: Simplify the first equation.\newline1.5a4.5b=3a+3b1.5a - 4.5b = 3a + 3b\newlineNow, move all terms involving variables to one side and constants to the other side.\newline1.5a3a=3b+4.5b1.5a - 3a = 3b + 4.5b\newlineCombine like terms.\newline1.5a=7.5b-1.5a = 7.5b\newlineNow, divide both sides by 1.5-1.5 to solve for aa.\newlinea=5ba = -5b
  3. Substitute Value of aa: Substitute the value of aa from Step 22 into the second equation.5.5b=5(b(5b))+2.5(5b)5.5b = 5(b - (-5b)) + 2.5(-5b)Simplify the equation by performing the operations.5.5b=5b+25b12.5b5.5b = 5b + 25b - 12.5bCombine like terms.5.5b=17.5b12.5b5.5b = 17.5b - 12.5b5.5b=5b5.5b = 5bNow, subtract 5b5b from both sides.0.5b=00.5b = 0Finally, divide both sides by 0.50.5 to solve for bb.b=0b = 0
  4. Calculate Value of a: Substitute the value of bb back into the equation a=5ba = -5b from Step 22 to find the value of aa.a=5(0)a = -5(0)a=0a = 0
  5. Calculate bab - a: Calculate bab - a using the values of bb and aa found in Steps 33 and 44.\newlineba=00b - a = 0 - 0\newlineba=0b - a = 0