Write Equations: Write down the system of equations to be solved.We have the system of equations:3x−4y=104x+3y=5
Eliminate y: Multiply the first equation by 4 and the second equation by 3 to eliminate y when we add the equations together.Multiplying the first equation by 4:4×(3x−4y)=4×1012x−16y=40Multiplying the second equation by 3:3×(4x+3y)=3×512x+9y=15
Add Equations: Add the two new equations together to eliminate y.(12x−16y)+(12x+9y)=40+1524x−7y=55
Solve for x: Solve the resulting equation for x.24x=55+7yx=2455+7ySince we cannot simplify this further without knowing the value of y, we will use this expression for x in the next steps.
Substitute for y: Substitute the expression for x back into one of the original equations to solve for y. We will use the first original equation: 3x−4y=10 Substitute x with (55+7y)/24: 3×((55+7y)/24)−4y=10(165+21y)/24−4y=10
Clear Fraction: Multiply through by 24 to clear the fraction.24×(24165+21y)−24×4y=24×10165+21y−96y=240
Solve for y: Combine like terms and solve for y.165−75y=240−75y=240−165−75y=75y=−7575y=−1
Substitute for x: Substitute the value of y back into the expression for x.x=(55+7y)/24x=(55+7(−1))/24x=(55−7)/24x=48/24$x = \(2\)
More problems from Solve equations involving like terms