Year 10 maths · B.2 · Systems of Equations
Solve systems by substitution
Put the expression for y into the other equation.
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Solve the system: y = −x + 7 and 3x + 4y = 26
Answer: x: 2; y: 5
Solve the system: y = x − 6 and 5x − 4y = 28
Answer: x: 4; y: -2
Solve the system: y = 3x − 6 and −x − 3y = −12
Answer: x: 3; y: 3
Tip: Put the expression for y into the other equation.
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