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3 years ago

What’s the answer to the question -7x + 15 = 36

Mathematics

1 answer:

konstantin123 [22]3 years ago

3 0

Answer:

-3

Step-by-step explanation:

-7x+15=36

or,-7x=36-15

or,-7x=21

or,x=21/-7

or,x=-3

This is the required answer.

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Jose swims 3 laps in a pool every 2 minutes how long would it take jose to swim 27 laps

kozerog [31]

Answer:

18 minutes

Step-by-step explanation:

It takes jose 2 minutes for 3 laps, so for 27 laps he would need 2*9 minutes.

8 0

2 years ago

PLZ HeLP

eimsori [14]

112.5...............

5 0

2 years ago

An easy question all wrong or unhelpful or no-work answers will be reported.

miss Akunina [59]

Elimination:

7x - 3y = 20
5x + 3y = 16
(add)
12x = 36
÷ 12
x = 3

(5 × 3) + 3y = 16
15 + 3y = 16
- 15
3y = 1
÷ 3
y = 1/3

Substitution:

5x + 3y = 16
- 3y
5x = 16 - 3y
÷ 5
x = 3.2 - 0.6y

5(3.2 - 0.6y) + 3y = 16
16 - 3y + 3y = 16
16 = 16
- 16
6y = 0
÷ 6
y = 0

Sorry the substitution messed up for some reason, I'll fix it after I've answered the other question

6 0

3 years ago

The sum of two numbers is 70. one number is 4 times as large as the other. What are the numbers?

FinnZ [79.3K]

One number is 4 times the other, so x and 4x.

The sum of two numbers is 4x+x=70.

Solve for x to get

x=70/5=14

the other number is 4x=4*14=56

4 0

3 years ago

Read 2 more answers

Use an equation to find the value of k

Delvig [45]

$\boxed{k=4}$

<h2>Explanation:</h2>

We know that the slope of a line is given by:

$m=\frac{y_{2}-y_{1}}{x_{2}-x_{1}} \\ \\ Where: \\ \\ (x_{1},y_{1}) \ and \ (x_{2},y_{2}) \ are \ points \ that \ lie \ on \ the \ line \\ \\ \\ Here: \\ \\ (x_{1},y_{1})=(-2,k) \\ \\ (x_{2},y_{2})=(2,0) \\ \\ m=-1 \\ \\ \\ -1=\frac{0-k}{2-(-2)} \\ \\ -1=\frac{-k}{4} \\ \\ -k=4(-1) \\ \\ \boxed{k=4}$

<h2>Learn more:</h2>

Proportional relationships lines, rates of change, and slope:

brainly.com/question/674693

#LearnWithBrainly

4 0

2 years ago