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AnnyKZ [126]
2 years ago
8

B=3/4a a+b=21 A. a=30 b=15 B.a=371/4 b=-161/4 C. a=20 b=11 D. a=12 b=9

Mathematics
1 answer:
lions [1.4K]2 years ago
6 0

Answer:

D option

Step-by-step explanation:

a + b = 21

Placing value of b as 3/4a,

a + 3/4a = 21

7a/4 = 21

a = 12

Putting value of a in b=3/4a,

b = 3 × 12/4 = 9

a = 12, b = 9

<em>Hope</em><em> </em><em>it</em><em> </em><em>helps</em><em>.</em><em> </em>

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Question 5
Vikentia [17]

The amount of sales (S) of statin in billions of dollars by 2017 is 34.5 billions

<h3>Linear equations</h3>

Linear equation are equation that has a leading degree of 1. Given the equation that represents Statins used to keep cholesterol in check and are a top-selling drug in the U.S.

S-1.5x = 6

where

S is the amount of sales

x is the number of years after 1998

By 2017, the total number of  years is 19 years

Substitute

S = 1.5x + 6

S = 1.5(19) + 6

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S = 34.5

The amount of sales (S) of statin in billions of dollars by 2017 is 34.5 billions

Learn more on linear equation here: brainly.com/question/14323743

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6 0
1 year ago
Can someone please help ​
3241004551 [841]

Answer:

x=3, y= - 2

Step-by-step explanation:

4x + 3y = 6

x-3y= 9

x=9+3y

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36+12y+3y=6

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y = - 2

=> x= 9+3y

x= 9+ 3.(- 2)

x= 3

3 0
2 years ago
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3 years ago
How do you do to find the percent of something?
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Step-by-step explanation:

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