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Find the solution of the system of equations.

{:[4x+14 y=-46],[-9x-7y=30]:}

Find the solution of the system of equations.\newline4x+14yamp;=469x7yamp;=30 \begin{aligned} 4 x+14 y & =-46 \\ -9 x-7 y & =30 \end{aligned}

Full solution

Q. Find the solution of the system of equations.\newline4x+14y=469x7y=30 \begin{aligned} 4 x+14 y & =-46 \\ -9 x-7 y & =30 \end{aligned}
  1. Write Equations: Write down the system of equations to be solved.\newlineWe have the system:\newline4x+14y=464x + 14y = -46\newline9x7y=30-9x - 7y = 30
  2. Eliminate Variable: Look for a way to eliminate one of the variables.\newlineWe can notice that the coefficients of yy in both equations are multiples of 77. We can multiply the second equation by 22 to make the coefficients of yy in both equations equal but opposite in sign, which will allow us to add the equations together to eliminate yy.
  3. Multiply Second Equation: Multiply the second equation by 22. \newline2(9x7y)=2(30)2(-9x - 7y) = 2(30) \newline18x14y=60-18x - 14y = 60
  4. Add Equations: Add the modified second equation to the first equation to eliminate yy.(4x+14y)+(18x14y)=46+60(4x + 14y) + (-18x - 14y) = -46 + 604x18x+14y14y=144x - 18x + 14y - 14y = 1414x=14-14x = 14
  5. Solve for x: Solve for x.\newlineDivide both sides by 14-14 to find the value of x.\newlinex=1414x = \frac{14}{-14}\newlinex=1x = -1
  6. Substitute for y: Substitute the value of xx back into one of the original equations to solve for yy. Using the first equation: 4(1)+14y=464(-1) + 14y = -46 4+14y=46-4 + 14y = -46
  7. Solve for y: Solve for y.\newlineAdd 44 to both sides of the equation to isolate the term with yy.\newline14y=46+414y = -46 + 4\newline14y=4214y = -42\newlineDivide both sides by 1414 to find the value of yy.\newliney=42/14y = -42 / 14\newliney=3y = -3