Ontario 09 Academic (MPM1D)
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Parallel lines

Interactive practice questions

The equations $y=2x$y=2x, $y=2x+6$y=2x+6 and $y=2x-8$y=2x8 have been graphed on the same number plane:

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a

What do all of the equations have in common?

Their $y$y-intercept ($b$b)

A

Their slope ($m$m).

B

Their $x$x-intercept.

C

Their $y$y-intercept ($b$b)

A

Their slope ($m$m).

B

Their $x$x-intercept.

C
b

What do you notice about the graphs?

All graphs cut the $y$y-axis at the same point.

A

All graphs cut the $x$x-axis at the same point.

B

All graphs have the same angle of inclination.

C

All graphs cut the $y$y-axis at the same point.

A

All graphs cut the $x$x-axis at the same point.

B

All graphs have the same angle of inclination.

C
c

What can you conclude from the answers above?

Equations with the same $x$x-intercept have graphs that have the same angle of inclination.

A

Equations with the same slope ($m$m) cut the $y$y-axis at the same point.

B

Equations with the same slope ($m$m) have graphs that have the same angle of inclination.

C

Equations with the same $y$y-intercept ($b$b) have graphs that have the same angle of inclination.

D

Equations with the same $x$x-intercept have graphs that have the same angle of inclination.

A

Equations with the same slope ($m$m) cut the $y$y-axis at the same point.

B

Equations with the same slope ($m$m) have graphs that have the same angle of inclination.

C

Equations with the same $y$y-intercept ($b$b) have graphs that have the same angle of inclination.

D
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Select all the statements that are true.

If two lines are parallel:

Is the line $y=4x-1$y=4x1 parallel to $y=4x-6$y=4x6 ?

Is the line $y=-8x-2$y=8x2 parallel to $y=9x+7$y=9x+7 ?

Outcomes

9D.AG2.04

Identify, through investigation, properties of the slopes of lines and line segments (e.g., direction, positive or negative rate of change, steepness, parallelism, perpendicularity), using graphing technology to facilitate investigations, where appropriate

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