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Nana76 [90]
3 years ago
15

-4x + 7 for x=1. evaluate each expression for the given value of x.

Mathematics
2 answers:
Crazy boy [7]3 years ago
6 0
-4(1)+7=-4+7=3
the answer is 3
Zarrin [17]3 years ago
3 0
-4(1)=-4+7=3
answer: 3
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Cosa/2-tana +sina/1-cota=cosa+sina​
Inessa05 [86]

Answer:

Cosa/2-tana+sina

Step-by-step explanation:

Cosatana

7 0
1 year ago
What dose "{" mean in algebra?<br><br> Ex.<br> {4y-2x-8<br> {5x-4y=20
GaryK [48]

Answer:

System of Equations

Step-by-step explanation:

A system of equations refers to a number of equations with an equal number of variables. We will only look at the case of two linear equations in two unknowns. The bracket on the left indicates that the two equations are intended to be solved simultaneously, but it is not always used.

4 0
2 years ago
Question 4 of 25 Use the substitution method to solve the system of equations the correct ordered par x+y=5 y=7​
alex41 [277]

Answer:

x = -2

y = 7

Step-by-step explanation:

x+y=5

y=7​

x+y=5

x + 7 = 5

x = -2

x+y=5

-2 + y = 5

y = 7

8 0
2 years ago
what is the answer help me
tankabanditka [31]

Answer:

B. 30°

Step-by-step explanation:

By remote interior angle theorem:

100° = x + 70°

100° - 70° = x

30° = x

x = 30°

6 0
3 years ago
Read 2 more answers
The difference in age between Brita and her daughter Eva is 30 years. The sum or their ages 118. How old is Eva?
Alona [7]

Answer:

Eva's age is 44 years

Step-by-step explanation:

Let

x ----> Brita's age

y ----> Eva's age

we know that

The sum or their ages 118

so

x+y=118 ----> equation A

The difference in age between Brita and her daughter Eva is 30 years

so

x-y=30 ----> equation B

Solve the system by elimination

Adds equation A and equation B

x+y=118\\x-y=30\\---------\\x+x=118+30\\2x=148\\x=74

<em>Find the value of y</em>

substitute the value of x in any equation

74+y=118\\y=118-74\\y=44

therefore

Eva's age is 44 years

3 0
3 years ago
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