# 1819 C2X §9.Practice Test

Which exercises should we discuss on the board?
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Slide 1: Mind map
WiskundeMiddelbare schoolhavoLeerjaar 2

This lesson contains 12 slides, with interactive quiz and text slides.

Lesson duration is: 50 min

## Items in this lesson

Which exercises should we discuss on the board?

#### Slide 1 -Mind map

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

#### Slide 2 -Slide

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

y + 137 = 15y - 339
137 = 14y - 339
476 = 14y
34 = y
y = 34

#### Slide 3 -Slide

Calculate point of intersection
Calculate the coordinates of the point of intersection between
y = 8x + 5 and y = 11 - 2x

#### Slide 4 -Slide

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=80.6+5=9.8
y=1120.6=9.8

#### Slide 5 -Slide

Solve inequalities
Solve 5x - 6 > 10 - 3x

#### Slide 6 -Slide

Solve inequalities
Solve 5x - 6 > 10 - 3x

5x - 6 = 10 - 3x
8x - 6 = 10
8x = 16
x = 2
Solution: x > 2

#### Slide 7 -Slide

Rearrange formulas
Express h in terms of t and write as short as possible:
2(h - 5) = t + 5

#### Slide 8 -Slide

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

#### Slide 9 -Slide

Substitute formulas
Substitute and simplify:
A: a  = 7 - 5t            B: t = -2h + 3

#### Slide 10 -Slide

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)

#### Slide 11 -Slide

HW Tuesday

Make and correct Practice Test CH9