Q. 1.5a−4.5b5.5b=3(a+b)=5(b−a)+2.5aIf (a,b) is the solution to the system of equations, then what is the value of b−a ?
Write Equations: Write down the given system of equations.The system of equations is:1.5a−4.5b=3(a+b)5.5b=5(b−a)+2.5a
Simplify First Equation: Simplify the first equation.Distribute the 3 on the right side of the first equation:1.5a−4.5b=3a+3bNow, move all terms involving variables to one side to set the equation to zero:1.5a−4.5b−3a−3b=0Combine like terms:−1.5a−7.5b=0
Simplify Second Equation: Simplify the second equation.Distribute the 5 on the right side of the second equation:5.5b=5b−5a+2.5aCombine like terms:5.5b=5b−2.5aNow, move all terms involving variables to one side to set the equation to zero:5.5b−5b+2.5a=0Combine like terms:0.5b+2.5a=0
Solve System of Equations: Solve the simplified system of equations.We now have the system:−1.5a−7.5b=02.5a+0.5b=0Multiply the second equation by 15 to make the coefficient of b the same in both equations:15(2.5a+0.5b)=15(0)37.5a+7.5b=0
Eliminate b: Add the two equations together to eliminate b. −1.5a−7.5b=0 37.5a+7.5b=0 ----------------- 36a=0 Divide both sides by 36 to solve for a: a=360 a=0
Find a: Substitute the value of a into one of the original simplified equations to find b. Using the second simplified equation: 2.5a+0.5b=0 Substitute a=0: 2.5(0)+0.5b=00+0.5b=0 Divide both sides by 0.5 to solve for b: b=0.50b=0
Find b: Calculate b−a.Since both a and b are 0:b−a=0−0b−a=0
More problems from Solve linear equations: mixed review