During a scuba dive lainey descended to a point 20 feet below ocean surface she continued to descent at a rate of 20 feet per minute write a inequality you could solve to find the number of minutes she can couturier to descend if she does not want to reach a point more than 100 feet below the ocean surface

4 minutes

Step-by-step explanation: First you have to realize that she has already descended 20 feet. After realizing this you add 20 feet to every minute. Once you get to minute 4, 100 feet have descended but no more than 100. this is because she started with 20 feel then added 80 feet after 4 minutes,  making it a total of 100 ft

4 minutes

Step-by-step explanation:

y=100x-20

100-20=80

80/20=4

x = -3

y = -18

step-by-step explanation:

to solve by substitution, substitute one variable and solve for the other. then substitute again to find the remaining variable.

x-1/3(3x-9) = -3 since y=3x-9 substittute y.

x-1/3(3x-9)=-3

x + x +3 = -3

2x+3=-3

2x+3-3= -3-3

2x=-6

x=-3

substitute again into y=3x-9

y=3(-3)-9

y=-9-9

y=-18

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step-by-step explanation:

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