What do you remember?

What are the names of the three units we had last semester?

• unit1,unit2,unit3

• Ms Song, Mr.Garrett,Mr.Chen

• Numbers, Linear,Quadratics

• same number

• no relationship

• both irrational

Sum of angles of a triangle

• 160

• 360

• 180

• 1

• -1

• 0

• i

If two lines are parallel, then

• their slope are the same

• their slope are negative reciprocal

what's the y-intercept of line y=3x+5?

• (0, 3)

• (5,0)

• (0,5)

Line 1: 3x+4y=2

Line 2:4x-3y=9

What do you know about the above two lines?

• They are perpendicular

• They are parallel

• They never meet