3 years ago

Solve the system by the substitution method. 7x + y = -6 7x - 3y = 18

Mathematics

2 answers:

Elodia [21]3 years ago

7 0

Answer:

Stdivise 7 aep-by-step explanation:

Yuri [45]3 years ago

3 0

Answer:

Step-by-step explanation:

7x + y = -6

y = -7x - 6

7x - 3y = 18

7x - 3(-7x - 6) = 18

7x + 21x + 18 = 18

7x + 21x = 18 - 18

28x = 0

x = 0/28

x = 0 <=========

7x + y = -6

7(0) + y = -6

0 + y = -6

y = -6 <==========

solution is : (0,-6)

You might be interested in

PLEASE HELP ME!!! I WILL GIVE ALL THESE POINTS HELP MEEE!!!!!

BlackZzzverrR [31]

Vertical angles are congruent due to the fact that they intersect. If they did not, they would in fact be parallel. (last section)

8 0

3 years ago

What is the LCD of the following rational expressions?

Aloiza [94]

$\dfrac{x}{x+1} \ , \ \dfrac{7x}{x-1}$

$\dfrac{x (x -1)}{(x+1)(x -1)} \ , \ \dfrac{7x(x+1)}{(x-1)(x+ 1)}$

<u>We know that (a + b)(a - b) = a² - b²:</u>

$\dfrac{x (x -1)}{x^2 - 1}} \ , \ \dfrac{7x(x+1)} {x^2 - 1}$

Answer: LCD = ( x + 1) (x - 1)

8 0

2 years ago

Read 2 more answers

How to factor 6x^2 + 8x + 7x + 21?

Nitella [24]

(23+15x) when you add this you will have your answer

8 0

3 years ago

15. • Solve the simultaneous equations

tamaranim1 [39]

Answer:
B. 1 and -2
Explanation:
First, add up the equations:
x-x+3y+y=4
4y=4
y=1
Now, plug y into any of the original equations above and solve for x:
-x+1=3
-x=2
x=-2
Therefore, the answer is B. 1 and -2

5 0

3 years ago

Ross drives 340 miles in 5 hour if ross continues to drive at the same rate how many miles can he drive in 10 hours?

yKpoI14uk [10]

He can drive about 680 miles in 10 hours.

7 0

2 years ago