3 years ago

I need help ASAP ! Nd plz help me how to show work

Mathematics

1 answer:

Kisachek [45]3 years ago

4 0

Answer:

x = -3

Step-by-step explanation:

y = -x + 2

7x + 4y = -1

Subsitution method: (Substitute y)

7x + 4(-x+2) = -1

Expand.

7x + (-4x + 8) = -1

One plus and one minus make one minus. Two plus makes a plus.

7x -4x + 8 = -1

Simplify.

3x + 8 = -1

Isolate 3x.

3x = -1-8

= -9

Find x.

x = -9 ÷ 3

= -3

You might be interested in

In ΔABC, the measure of ∠C=90°, the measure of ∠A=40°, and BC = 2.6 feet. Find the length of CA to the nearest tenth of a foot.

vladimir1956 [14]

Answer:

3.1

Step-by-step explanation:

8 0

3 years ago

Write the expression. Then, check all that apply.

liberstina [14]

Answer:

2(n - 6)

Step-by-step explanation:

Difference = n - 6

Twice the Difference = 2(n - 6)

5 0

4 years ago

Read 2 more answers

tom and some friends went to a movie the show started at 230 pm and ended at 415 pm how long did the movie last

viva [34]

From 2:30-3:30 is 1hr and from 3:30-4:00 is 30 min from 4:00-4:15 is 15 minutes

Add up these time you get 1hr and 45min

6 0

4 years ago

Read 2 more answers

Write 3,047.092 in expanded form

Grace [21]

Step-by-step explanation:

$\: \: \: \: \: \: \: \: \: = > \: 3000 \: + \: 40 \: + \: 7 \: + \: \frac{9}{100} \: + \: \frac{2}{1000}$

$hope \: it \: helps \: ..$

7 0

3 years ago

Evaluate sin(arccos(-4/<br><img src="https://tex.z-dn.net/?f=evaluate%20%20%20%20%5C%3A%20sin%28arccos%28%20%20%20-%20%20%5Cfrac

Bess [88]

Answer:

sin(arccos(-4/√25)) = 0.6

Step-by-step explanation:

The expression you want to evaluate is

sin(arccos(-4/√25))

= sin(arccos(-4/5))

We place this expression into a calculator and get the result

arccos(-4/5) = 2.498 rads = 143.1°

then

sin(143.1°) = 3/5

sin(143.1°) = 0.6

sin(arccos(-4/√25)) = 0.6

5 0

4 years ago