#### Simplify the algebraic expression_2

If we simplify the expression: $3,5x-2y+6,5x-3,5y+2,3-7x-6$ the result is....

# Linear equations

Learning
8

#### Distributive Property in Algebraic Expressions_1

Fill in the blanks with numbers to make the following equalities true

# Linear equations

Training
8

#### Tangent and normal lines

Consider the function $f$, with domain $D_f = \left[0, 1\right]$, defined by $f(x)= \dfrac{\pi}{2} -2 \arcsin(1-2x)$. Let $r$ be the line tangent to the graph of the function $f$ at the point with abscissa $a$. It is known that line $r$ is perpendicular to line $x+4y=12$.

# Functions of one variable

Training
13

#### Missing coordinate

Give the missing coordinate p of the point P(2.2;p) in that way, that P is element of the graph of the linear function f with f: y = 4.4 - 0.5 x

# Linear functions

Training
7

#### Escalator

The ride on an escalator can be described by the function f with f: y = -0.4 x + 6.6. Thereby x is in this equation the time for the ride in seconds, y the height in meter. A person takes the escalator to the next floor. The next floor is 3.5 m heigt. Estimate the time for the ride.

# Linear functions

Modeling
5

#### Solving linear equation 1

Solve the linear equation by equivalent transformation. 7x + 22 = 71

# Linear equations

Training
7