Q. Find the solution of the system of equations.4x+14y−9x−7y=−46=30
Write Equations: Write down the system of equations to be solved.We have the system:4x+14y=−46−9x−7y=30
Eliminate Variable: Look for a way to eliminate one of the variables.We can notice that the coefficients of y in both equations are multiples of 7. We can multiply the second equation by 2 to make the coefficients of y in both equations equal but opposite in sign, which will allow us to add the equations together to eliminate y.
Multiply Second Equation: Multiply the second equation by 2. 2(−9x−7y)=2(30)−18x−14y=60
Add Equations: Add the modified second equation to the first equation to eliminate y.(4x+14y)+(−18x−14y)=−46+604x−18x+14y−14y=14−14x=14
Solve for x: Solve for x.Divide both sides by −14 to find the value of x.x=−1414x=−1
Substitute for y: Substitute the value of x back into one of the original equations to solve for y. Using the first equation: 4(−1)+14y=−46−4+14y=−46
Solve for y: Solve for y.Add 4 to both sides of the equation to isolate the term with y.14y=−46+414y=−42Divide both sides by 14 to find the value of y.y=−42/14y=−3