Question

fill in the table using this function rule,
y = 21 - 3x
(the table has x values 1, 2, 4, 6 and corresponding y values to be filled)

Explanation:

Step1: Substitute \( x = 1 \) into \( y = 21 - 3x \)

\( y = 21 - 3\times1 = 21 - 3 = 18 \)

Step2: Substitute \( x = 2 \) into \( y = 21 - 3x \)

\( y = 21 - 3\times2 = 21 - 6 = 15 \)

Step3: Substitute \( x = 4 \) into \( y = 21 - 3x \)

\( y = 21 - 3\times4 = 21 - 12 = 9 \)

Step4: Substitute \( x = 6 \) into \( y = 21 - 3x \)

\( y = 21 - 3\times6 = 21 - 18 = 3 \)

Answer:

When \( x = 1 \), \( y = 18 \); when \( x = 2 \), \( y = 15 \); when \( x = 4 \), \( y = 9 \); when \( x = 6 \), \( y = 3 \)

So the completed table (rows in order of \( x = 1, 2, 4, 6 \)) has \( y \)-values: 18, 15, 9, 3