A dragonfly can beat its wings 30 times per second. Write an equation in slope-intercept form that shows the relationship between flying time in seconds and the number of times the dragonfly beats its wings.

The table shows the temperature $(y)$ at different altitudes $(x)$. This is a linear relationship. (Example 2)

Altitude (ft), x	0	2,000	4,000	6,000	8,000	10,000	12,000
Temperature (^(@)F),y	59	51	43	35	27	19	11

Use your equation to determine the that represents this relationship. temperature at an altitude of 5000 feet.

Hari's weekly allowance varies depending on the number of chores he does. He received $\$ 16$ in allowance the week he did 12 chores, and $\$ 14$ in allowance the week he did 8 chores. Write an equation for his allowance in slope-intercept form.

Explain what $m$ and $b$ in the equation $y=m x+b$ tell you about the graph of the line with that equation.

A salesperson receives a weekly salary plus a commission for each computer sold. The table shows the total pay, p, and the number of computers sold, $n$. Write an equation in slope-intercept form to represent this situation.

Number of computers sold, n	4	6	8	10	12
Total pay ($), p	550	700	850	1000	1150

Write the equation of the given linear relationship in slope-intercept form.

x	25	35	45	55
y	94	88	82	76

The table shows the temperature $(y)$ at different altitudes $(x)$. This is a linear relationship. (Example 2)

Altitude (ft), x	0	2,000	4,000	6,000	8,000	10,000	12,000
Temperature (^(@)F),y	59	51	43	35	27	19	11

Write an equation in slope-intercept form

Write the given fraction as a decimal.

$$\dfrac{0.39}{0.75}$$

How can you use a graph of a linear relationship to predict an unknown value of $y$ for a given value of $x$ within the region of the graph?

Which is the sum of $3.15 \times 10^7+$ $9.3 \times 10^6$? Write your answer in scientific notation. (A) $4.08 \times 10^7$ (B) $4.08 \times 10^6$ (C) $0.408 \times 10^8$ (D) $40.8 \times 10^6$

Write the given fraction as a decimal.

$$\dfrac{0.13}{0.2}$$

What are the slope and $y$-intercept of the relationship shown in the table?

x	10,000	20,000	30,000
y	2,500	3,000	3,500

(A) slope $=0.05, y$-intercept $=1,500$ (B) slope $=0.5, y$-intercept $=1,500$ (C) slope $=0.05, y$-intercept $=2,000$ (D) slope $=0.5, y$-intercept $=2,000$

The table shows the temperature $(y)$ at different altitudes $(x)$. This is a linear relationship. (Example 2)

Altitude (ft), x	0	2,000	4,000	6,000	8,000	10,000	12,000
Temperature (^(@)F),y	59	51	43	35	27	19	11

Find the $y$-intercept for this relationship.

At $59^{\circ} \mathrm{F}$, crickets chirp at a rate of 76 times per minute, and at $65^{\circ} \mathrm{F}$, they chirp 100 times per minute. Write an equation in slope-intercept form that represents the situation. Input variable:________________ Output variable:_______________ $m=\frac{y_2-y_1}{x_2-x_1}=$ ___________ Use the slope and one of the ordered pairs in $y=m x+b$ to find $b$.____________ $=__________.+b;________=b$ Write an equation in slope-intercept form.____________.