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Grade 8 Algebra: Solving Systems by Substitution

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Level 1

One variable already isolated

  1. 1. Solve by substitution:
    {y=2xx+y=12\begin{cases} y = 2x \\ x + y = 12 \end{cases}
  2. 2. Solve by substitution:
    {y=x+3x+y=9\begin{cases} y = x + 3 \\ x + y = 9 \end{cases}
  3. 3. Solve by substitution:
    {x=3yx+y=16\begin{cases} x = 3y \\ x + y = 16 \end{cases}
  4. 4. Solve by substitution:
    {y=4x2x+y=18\begin{cases} y = 4x \\ 2x + y = 18 \end{cases}
  5. 5. Solve by substitution:
    {y=x−23x+y=14\begin{cases} y = x - 2 \\ 3x + y = 14 \end{cases}
  6. 6. Solve by substitution:
    {x=y+5x+2y=11\begin{cases} x = y + 5 \\ x + 2y = 11 \end{cases}
  7. 7. Solve by substitution:
    {y=52x+y=13\begin{cases} y = 5 \\ 2x + y = 13 \end{cases}
  8. 8. Solve by substitution:
    {y=2x+1x+y=10\begin{cases} y = 2x + 1 \\ x + y = 10 \end{cases}