Question

Complete the table of values for the equation:y - 2x = 21What is the missing value (?) that belongs in the table below?

Answer 1

Given a table of values for the equation below

`y-2x=21`

To find the missing value, substitute the value of x into the given equation to find the value of y (missing value)

Where, x = -1

`\begin{gathered} y-2x=21 \\ y-2(-1)=21 \\ y+2=21 \\ Collect\text{ like terms } \\ y=21-2 \\ y=19 \end{gathered}`

Hence, the missing value is 19