1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
prisoha [69]
2 years ago
5

-4x+8y=-256 -6y = x. how do u solve this equation by substitution.

Mathematics
1 answer:
serious [3.7K]2 years ago
4 0
To make it soo much easier, divide top equation by 4
-x+2y=-64

now
-6y=x
sub -6y for x
-(-6y)+2y=-64
6y+2y=-64
8y=-64
divide both sides by 8
y=-8

sub back
-6y=x
-6(-8)=x
48=x

x=48
y=-8
(x,y)
(48,-8)
You might be interested in
Given the functions f(x)=2x^2-3x-8 and g(x)=3x2+5x+1
kykrilka [37]

Answer:

B

Step-by-step explanation:

the product (2x² - 3x - 8)(3x² + 5x + 1) is required

multiply each term in the second factor by each term in the first factor.

= 2x²(3x² + 5x + 1) - 3x(3x² + 5x + 1) - 8(3x² + 5x + 1) ← distribute

= 6x^{4} + 10x³ + 2x² - 9x³ - 15x² - 3x - 24x² - 40x - 8

collecting like terms gives

6x^{4} + x³ - 37x² - 43x - 8 → B


8 0
3 years ago
Please answer the question
raketka [301]
Interest is $1,320.  <span><span>P is the principal amount, $6,600.
</span><span>r is the interest rate, 4% per year, or in decimal form, 4/100=0.04.
</span><span>t is the time involved, 5 years time periods.
</span><span>So, t is 5 year time periods.

</span></span>I= p x r x t

In order to get the final number just add $1,320 + $6,600 which is $7,920
7 0
3 years ago
Help me please it’s math so... yea.... a b c d e f g h I j k l m n o p q r s t u v w x y z
Ugo [173]
Answer= 16

Work=
1. Multiply each side by 1/5 (aka divide them by 5). This leaves 3, 4 and 9.

2. Add all the sides. 3 + 4 + 9 = 16. That is the perimeter
3 0
3 years ago
What is 17.70 = 7/2m + 13.50 ?
Fantom [35]

<u>answer:</u>  m = 1.2

<u>work:</u>

17.70 = \frac{7}{2} m + 13.50  | subtract 13.50 and move it over

4.2 = \frac{7}{2}m  | divide by 7/2

1.2 = m  | final answer

6 0
3 years ago
a countrys population in 1995 was 175 million . in 2000 it was 181 million estimate the population in 2020 using the exponential
galben [10]
In 5 years it grew 6 mill (181-175=6). Formula: 6(20/5)+181=X. multiply 6 by 4 (the number of five years in twenty years): 24. 24+181=205 million :)
7 0
3 years ago
Other questions:
  • Which equation represents a direct linear variation?
    12·1 answer
  • 87 markes out of 100 as a percentage
    15·1 answer
  • How does the graph of y=1/2(x+4)^2compare to the graph of y=(x-1)^2 -3?
    10·1 answer
  • Turn 8/20 into a fraction and simply it
    5·2 answers
  • a solid circular cylinder of radius 7 cm and length 8 cm is made out of metal alloy. given that 1 cm³ of the alloy has a mass of
    11·1 answer
  • Jack spends 15% of his pocket money on sweets and 35% on magazines. He saves the rest
    5·1 answer
  • Kirsten is 5 feet tall. How tall is she in inches? 60 inches 50 inches 48 inches 45 inches
    15·2 answers
  • Help pleaseee due tonight :(
    11·2 answers
  • I need help with this​
    6·2 answers
  • Let A,B, and C be square invertible matrices of the same size. If C has no eigenvalue equal to -1, then (AB + ACB)^-1 is equal t
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!