To draw shapes,angles or lines accurately.
Answer: x = 4
Step-by-step explanation:
2x - 3 + 4x = 21
6x - 3 = 21
6x - 3 (+3) = 21 (+3)
6x = 24
24/6
x = 4
7x+8y=19
-6x -8y=18
--------------- <em>Add both equations</em>
x = 37
Using x = 37 in the first equation:
7(37)+8y=19
259+8y = 19
8y = 19 - 259
8y = -240
y = -240/8
<h3>y = -30</h3>
The situation which can be defined using an exponential function is "The number of bacteria decreases by 7% each hour".
<h3>What is an exponential function?</h3>
An exponential function is used to represent a situation in which values of an event do not increase at a constant or linear rate.
From the above,
- The value of the stocks decreased by $100 last year is a linear function.
- The number of bacteria increases by 700 each hour is a linear function.
- The value of the stocks increases by $10 every year you own them is a linear function.
Learn more about exponential function:
brainly.com/question/12708214
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Step-by-step explanation:
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