Question

Can someone explain this to me please?

Answer 1

You have to substitute the x values in to the function and solve for y.

Complete the T-table with the y-values, the points and draw a straight line through them.

For instance,
The function is

$y = - 3x + 5$

when
$x = - 1$
$y = - 3( - 1) + 5$
$\rightarrow \: y = 3 + 5 = 8$
Write 8 in the table under y next to -1


When
$x = 0$
$y = - 3(0) + 5$
$y = 0 + 5 = 5$
Fill in the T-table with 5 next to 0.


When

$x = 1$
$y = - 3(1) + 5$
$y = - 3 + 5 = 2$
Fill in 2 next to 1


Now plot the points

(-1,8) , (0,5) and (1,2)


and draw a straight line through them