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Find the solution of the system of equations.

{:[3x-3y=0],[15 x+6y=42]:}

Find the solution of the system of equations.\newline3x3yamp;=015x+6yamp;=42 \begin{aligned} 3 x-3 y & =0 \\ 15 x+6 y & =42 \end{aligned}

Full solution

Q. Find the solution of the system of equations.\newline3x3y=015x+6y=42 \begin{aligned} 3 x-3 y & =0 \\ 15 x+6 y & =42 \end{aligned}
  1. Analyze Equations: Analyze the system of equations.\newlineWe have the system:\newline3x3y=03x - 3y = 0\newline15x+6y=4215x + 6y = 42\newlineWe need to find the values of xx and yy that satisfy both equations simultaneously.
  2. Simplify First Equation: Simplify the first equation.\newlineThe first equation can be simplified by dividing both sides by 33 to isolate xx in terms of yy.\newline(3x3y)/3=0/3(3x - 3y) / 3 = 0 / 3\newlinexy=0x - y = 0\newlinex=yx = y
  3. Substitute and Solve: Substitute xx with yy in the second equation.\newlineSince x=yx = y, we can replace xx with yy in the second equation to find the value of yy.\newline15y+6y=4215y + 6y = 42
  4. Combine and Find y: Combine like terms and solve for y.\newline15y+6y=4215y + 6y = 42\newline21y=4221y = 42\newliney=4221y = \frac{42}{21}\newliney=2y = 2
  5. Substitute Back for xx: Substitute yy back into x=yx = y to find the value of xx.\newlineSince x=yx = y and we found y=2y = 2, then x=2x = 2.
  6. Check Solution: Check the solution in both original equations.\newlineFirst equation: 3x3y=03x - 3y = 0\newline3(2)3(2)=03(2) - 3(2) = 0\newline66=06 - 6 = 0\newline0=00 = 0 (True)\newlineSecond equation: 15x+6y=4215x + 6y = 42\newline15(2)+6(2)=4215(2) + 6(2) = 42\newline30+12=4230 + 12 = 42\newline42=4242 = 42 (True)\newlineBoth checks are correct, so the solution (x,y)=(2,2)(x, y) = (2, 2) satisfies both equations.