#### Describe the equation

Fill in the blanks to describe the equation: 4 - 3x = -11
# Linear equations
# Terms with variables

Training
7

#### Solving linear equation 2

Solve the linear equation by equivalent transformation. 24x - 36 = 6

# Linear equations

Training
7

#### Set up a linear equation

Ron is 6 times as old as Lilly. The age difference between the two is 10 years. How old is Lilly? Write an equation for Lilly's age using the variable x for her age.

# Terms with variables

Reasoning
7

#### Angles of triangles

In this isosceles triangle, the angles at the base are twice the angle b at the apex. Choose a suitable equation that you can use to calculate the angle b.
# Triangles
# Angles

Training
7

#### Perimeter kite

In a kite-rectangle, one side is three times as long as the other x. Cross all terms that can be used to determine the perimeter of the figure.

# Terms with variables

Modeling
7

#### Sequence of triangles 1

Determine the numbers of small trinagles for the given step.