LET’S TRY ONE
For y = 2x − 3, find y when x = −2.
−7
2 × (−2) − 3 = −4 − 3 = −7.
Learning steps & teaching tips
Find an output from a linear rule and a signed input.
- Substitute with parentheses so a negative input keeps its sign.
- Work through the example. Explain how its evidence supports the answer.
- Try a new question; use the explanation to check your thinking.
Try it together
Write or draw your own example with different numbers. Solve it, then ask a partner to check the method as well as the answer.
Substitute with parentheses so a negative input keeps its sign.