Find and Use Slopes of Lines

Sarah proved that this is a square. The slopes of -2/5 and 5/2 made her able to do this. How come?

• Because those slopes form parallel lines.

• Because those slopes form perpendicular lines, creating right angles.

• Because those slopes make the sides congruent.

• Yes, because it has perpendicular slopes.

• No, because even though they are flipped, one needs to be negative. 

Tags

CCSS.HSG.CO.C.11

Find the slope of the line.

• -2

• 2

• -1

• 1

Tags

CCSS.8.EE.B.5

How do you prove parallel?

• Slopes

• distance formula

• Pythagorean theorem

• Pythagorean theorem or distance formula

Slopes of perpendicular lines are...

• opposite reciprocals.

• opposites.

• identical.

• always 7.

Tags

CCSS.8.EE.B.6

What PROVES two lines are parallel to each other?

• opposite sides are congruent

• The slope is the same for both lines

• They look like it

• The lines have a slope that is a reciprocal of the other

Tags

CCSS.8.EE.B.6

how are lines perpendicular?

• same slope

• opposite reciprocal slope

• Pythagorean theorem

• distance formula

Tags

CCSS.8.EE.B.6

To prove a parallelogram you need to calculate and compare?

• all slopes

• all slopes and all side lengths

• all side lengths

• congruent slopes

Tags

CCSS.HSG.CO.B.7

How do you prove perpendicular?

• Slopes

• distance formula

• Pythagorean theorem

• Pythagorean theorem or distance formula

y = -2x - 4
y = 1/2 x + 7
are...

• parallel 

• perpendicular

• neither

Tags

CCSS.HSG.CO.C.11