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
il63 [147K]
3 years ago
15

Solve it by substitution method:- 5x - 6y=-9 and 3x + 4y= 25

Mathematics
1 answer:
user100 [1]3 years ago
8 0
\left\{\begin{array}{ccc}-5x-6y=-9&/\cdot2\\3x+4y=25&/\cdot3\end{array}\right\\+\left\{\begin{array}{ccc}-10x-12y=-18\\9x+12y=75\end{array}\right\\------------\\.\ \ \ \ \ \ \ -x=57\\.\ \ \ \ \ \ \ \ \ x=-57\\\\3\cdot(-57)+4y=25\\-171+4y=25\\4y=25+171\\4y=196\ \ \ \ /:4\\y=49\\\\Solution:x=-57;\ y=49.
You might be interested in
Multiply (5 × 104)(7 × 103), express in scientific notation.
salantis [7]
C) 35*107

7*5=35

103+4=107
5 0
4 years ago
Read 2 more answers
Can you please help me?​
yan [13]

Answer:

-3, -4, -4, 0, 16, 64, 192.

Step-by-step explanation:

I don't know for sure if this is correct, but when i did it theses are the answers i got. You do y=8*2^x. Meaning you substitute the x for the x values such as -3, -2, and -1.  

Also if you have one there's a setting you can go to on an actual calculator and type in this on a Y/X chart. I didn't use one this time because i don't have one, but thought you'd find that information useful.

6 0
3 years ago
Helppppppppppppppppppppp
Greeley [361]

Answer: 144ft

Step-by-step explanation: Hope this help :D

6 0
3 years ago
Can someone please help me with these math problems ASAP?!<br> Thanks in advance! ;)
Mamont248 [21]

Answer:

11) Here given Function,

f(x) = \sqrt{2x-11}

And, g(x) = -|0.1|x+5

For f(x) = g(x)

\sqrt{2x-11}=-|0.1|x+5

2x-11=(-|0.1|x+5)^2

2x-11=0.01x^2 - 10|0.1|x+25

2x=0.01x^2 - 10|0.1|x+25+11

2x=0.01x^2 - 10|0.1|x+36

0.01x^2 - 10|0.1|x - 2x+36=0

When we solve this equation,

We found,

 x = 12.5227 ≈ 12.53

Thus, the required solution is, x = 12.53

12) Here the height of rocket A in x second,

f(x) = -16x^2+74x+9

And, The height gain by the rocket B in x seconds,

g(x) = -16x^2+82x

If at x seconds both A and B gain the same height,

That is, f(x) = g(x)

⇒ -16x^2+74x+9= -16x^2+82x

⇒74x + 9 = 82x

⇒ 82x - 74x = 9

⇒ 8x = 9

⇒ x = 1.125 ≈ 1.13

Thus, the required solution is x = 1.13 seconds (approx)


4 0
3 years ago
Twice a number increased by 2 is zero
Dmitry_Shevchenko [17]
Alright, so 2x+2=0 (with x being the number) is what I'm getting from this. Subtract 2 from both sides to get 2x=-2, and then divide by 2 to get x=-1
7 0
3 years ago
Read 2 more answers
Other questions:
  • A marathon is 138,336 ft long. how long is this distance in miles?
    5·2 answers
  • Josh currently bench presses 150 lbs. He increases that amount by 10% a month for 3 months. About how much can bench press now?
    5·2 answers
  • 8th grade math ,please answer
    6·2 answers
  • A map is drawn to a scale of 1:50000.The distance between long mountain and plaine des papayes is 17.5 cm on the map.find the ac
    7·1 answer
  • Find the length of BC
    13·1 answer
  • Please help, this is for a final grade and it affects how I place
    13·1 answer
  • What do you get when you cross an electric eel and a sponge puzzle time riddle
    7·1 answer
  • If the length of a rectangle is decreased by 6 cm and the width is increased by 3 cm, the result will be a square, the area of w
    11·1 answer
  • 7. The minimum distance between two fence posts is 4 feet. The maximum distance is 10 feet. Write an
    8·1 answer
  • Which choice is equivalent to the expression below? 27.19 O A. 27+1/10 + 9/10 O B. 27. 219/10 c. 27. 21/10.29/100 O D. 2? + 21/1
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!