Work through the levels in order. Type your answer and press Check — open the worked solution if you get stuck. Answers like -6, 3/4 or 0.25 are typed exactly as shown.
Level 1 · Warm-up
1 For y = 2x + 1, find y when x = 4.
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2(4) + 1 = 9.
2 For y = 3x − 2, find y when x = 5.
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15 − 2 = 13.
3 For y = 2x + 1, find y when x = 0.
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0 + 1 = 1.
Level 2 · Core
4 For y = 2x + 1, find y when x = −1.
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−2 + 1 = −1.
5 For y = 3x − 2, find y when x = −2.
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−6 − 2 = −8.
6 For y = −2x + 5, find y when x = 2.
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−4 + 5 = 1.
Level 3 · Challenge
7 For y = −4x + 1, find y when x = −3.
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12 + 1 = 13.
8 A table gives x: 0,1,2,3 and y: 5,9,13,17. Write the rule. (as a rule)
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Step +4 and y = 5 at x = 0 → y = 4x + 5.
9 A table gives x: 0,1,2,3 and y: 10,7,4,1. Write the rule. (as a rule)
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Step −3 and y = 10 at x = 0 → y = −3x + 10.