1819 C2X §9.Practice Test

• Wiskunde
• Middelbare school
• havo
• Leerjaar 2

Which exercises should we discuss on the board?

Solve linear equations

Solve          y + 137 = 3(6y-113) - 3y

Solve linear equations

Solve          y + 137 = 3(6y-113) - 3y

                      y + 137 = 15y - 339

                             137 = 14y - 339

                            476 = 14y

                               34 = y

                                  y = 34

Calculate point of intersection

Calculate the coordinates of the point of intersection between

y = 8x + 5 and y = 11 - 2x

Calculate point of intersection

Calculate the coordinates of the point of intersection between

y = 8x + 5 and y = 11 - 2x

8x + 5 = 11 - 2x                  

10x + 5 = 11

10x = 6

x = 0.6                     Point of intersection is (0.6, 9.8)

y=8⋅0.6+5=9.8

y=11−2⋅0.6=9.8

Solve inequalities

Solve 5x - 6 > 10 - 3x

Solve inequalities

Solve 5x - 6 > 10 - 3x

5x - 6 = 10 - 3x

8x - 6 = 10

8x = 16

x = 2

                 Solution: x > 2

Rearrange formulas

Express h in terms of t and write as short as possible:

2(h - 5) = t + 5

Rearrange formulas

Express h in terms of t and write as short as possible:

2(h - 5) = t + 5

2h - 10 = t + 5

2h = t + 15

h = 0.5t + 7.5

Substitute formulas

Substitute and simplify:

A: a  = 7 - 5t            B: t = -2h + 3

Substitute formulas

Substitute and simplify:

A: a  = 7 - 5t            B: t = -2h + 3

a = 7 - 5(-2h + 3)

a = 7 + 10h - 15

a = 10h - 8      (or a = -8 + 10h)

HW Tuesday

Make and correct Practice Test CH9

Prepare any questions you have about this chapter