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
ss7ja [257]
3 years ago
10

Please I really need help 100 points

Mathematics
2 answers:
Amiraneli [1.4K]3 years ago
5 0

Answer:

<h2>x = 3 and y = -1 ⇒ (3, -1)</h2>

Step-by-step explanation:

\left\{\begin{array}{ccc}2x-3y=9&\text{multiply both sides by 5}\\3x+5y=4&\text{multiply both sides by 3}\end{array}\right\\\\\underline{+\left\{\begin{array}{ccc}10x-15y=45\\9x+15y=12\end{array}\right}\qquad\text{add both sides of the equations}\\.\qquad19x=57\qquad\text{divide both sides by 19}\\.\qquad x=3\\\\\text{Put the value of x to the second equation:}\\\\3(3)+5y=4\\9+5y=4\qquad\text{subtract 9 from both sides}\\5y=-5\qquad\text{divide both sides by 5}\\y=-1

Afina-wow [57]3 years ago
4 0

Multiply the first equation by 3 and the second equation by 2:

\begin{cases}6x-9y=27\\6x+10y=8\end{cases}

Subtract the two equation to get rid of the x variable:

-9y-10y=27-8 \iff -19y = 19 \iff y = -1

Use the value of y to determine the value of x: for example, using the first equation we have

2x+3=9 \iff 2x=6 \iff x=3

You might be interested in
If h(x)=x^2-5x, g(x)=2x, f(x)=3x-2, what is h(f(g(x)))
Aleonysh [2.5K]

Step-by-step explanation:

start from f(g(x))

f(g(x))= 3(g(x)) -2

f(g(x))= 6x -2

h(f(g(x)))=(f(g(x)))² -5(f(g(x)))

h(f(g(x)))=(6x-2)² -5(6x-2)

h(f(g(x)))=36x²-24x+4-(30x-10)

h(f(g(x)))=36x²-24x+4-30x+10

h(f(g(x)))=36x²-54x+14

6 0
3 years ago
Two blocks are connected by a very light string passing over a massless and frictionless pulley. The 20.0 N block moves 75.0cm t
Angelina_Jolie [31]
The string is assumed to be massless so the tension is the sting above the 12.0 N block has the same magnitude to the horizontal tension pulling to the right of the 20.0 N block. Thus, 
1.22 a = 12.0 - T  (eqn 1)
and for the 20.0 N block: 
2.04 a = T - 20.0 x 0.325 (using µ(k) for the coefficient of friction) 
2.04 a = T - 6.5  (eqn 2) 

[eqn 1] + [eqn 2] → 3.26 a = 5.5 
a = 1.69 m/s² 


Subs a = 1.69 into [eqn 2] → 2.04 x 1.69 = T - 6.5 
T = 9.95 N 

Now want the resultant force acting on the 20.0 N block: 
Resultant force acting on the 20.0 N block = 9.95 - 20.0 x 0.325 = 3.45 N 
<span>Units have to be consistent ... so have to convert 75.0 cm to m: </span>

75.0 cm = 75.0 cm x [1 m / 100 cm] = 0.750 m 
<span>work done on the 20.0 N block = 3.45 x 0.750 = 2.59 J</span>
3 0
2 years ago
¿Cuántos litros hay en 25 vasos si cada vaso contiene 0,20 litros?
Norma-Jean [14]
Voy a decir que son 5 litros
4 0
3 years ago
A freezer can be bought on hire purchase by making a desposiy of 15% of the cash price which is $2975 the interest which is 20%
Liono4ka [1.6K]

Answer: See explanation

Step-by-step explanation:

a. The deposit

= 15% × $2975

= 15/100 × $2975

= 0.15 × $2975

= $446.25

b. The hire purchase price

Outstanding balance = $2975 - $446.25 = $2528.75

20% of outstanding balance

= 20% × $2528.75

= 0.2 × $2528.75

= $505.75

Hire purchase price

= $2975 + $505.75

= $3480.75

c. The difference the hire purchase price and cash price

= $3480.75 - $2975

= $505.75

d. The difference as a percentage of the cash price.

= ($505.75 / $2975) × 100

= 0.17 × 100

= 17%

5 0
2 years ago
Please help, the question says what statement best describes the placement of the lines Carson Drew​
blagie [28]

Answer:

Only line A is a well-placed line of best fit.

Step-by-step explanation:

I did this on Plato and got it correct.

7 0
2 years ago
Other questions:
  • Garrett has 15 comic books. Dana has c times as many comic books as Garrett. Write an expression that shows how many comic books
    13·1 answer
  • Whats the cube root of 110567 by prime factorization
    13·1 answer
  • Help quick !!!!!!!!!!!!!!
    12·2 answers
  • Myra polled twenty-five students in her class to determine the number of movies the students attended at the theater this year.
    14·2 answers
  • Quick Answer Fast!!!!! five of the six tempstures for one day in june were 67, 72, 82, 79, and 80. If the mode of this data set
    14·1 answer
  • Idk what to do helppp?​
    15·1 answer
  • What is cosA ?<br><br><br><br> Enter your answer, as a simplified fraction, in the box.
    13·1 answer
  • PLS HELP!!!
    12·1 answer
  • What is the constant of proportionality in this proportional relationship?
    12·1 answer
  • A pound of chocolate costs 8 dollars. Jessica buys P pounds. Write an equation to represent the total cost c that jessica pays
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!