State whether each equation or function is linear. Write yes or no. If no, explain your reasoning.

1.h(x)=23

2.y=2/3x

3.y=5/x

4.9-5xy=2

write each equation in standard form. Identify A, B, and C.

5.y=7x-5

6.y=3/8x+5

7.3y-5=0

8.x=-2/7y+3/4

find the x-intercept and the y-intercept of the graph of each equation. Then graph the equation.

9.y=2x+4

10.2x+7y=14

11.y=-2x-4

12.6x+2y=6

13. The equation y=2.54x gives the length in centimeters corresponding to a length x in inches. What is the length in centimeters of a 1-foot ruler?

for meg's long distance calling plan, the monthly cost C in dollars is given by the linear function C(t)=6+0.05t, where t is the number of minutes talked.

14.What is the total cost of tslking 8 hours? of talking 20 hours?

15.What is the effective cost per minute(the total cost divided by the number of minutes talked) of talking 8 hours? of talking 20 hours?