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Year 8 maths · J.4 · Systems of equations

Solve a system by substitution: both equations in slope-intercept form

Use substitution or elimination so that you find x and y. Write your answer as (x, y).

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  1. Solve the system: y = 3x + 15 and y = −x + 3. Write your answer as (x, y).

    Answer: (-3, 6)

  2. Solve the system: y = 2x − 11 and y = 5x − 23. Write your answer as (x, y).

    Answer: (4, -3)

  3. Solve the system: y = −4x − 14 and y = −2x − 4. Write your answer as (x, y).

    Answer: (-5, 6)

Tip: Use substitution or elimination so that you find x and y. Write your answer as (x, y).

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