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
iVinArrow [24]
3 years ago
14

Simutaneous equation by substitution:y+2x=0,4x+y=3..................solve for x and y

Mathematics
1 answer:
Lunna [17]3 years ago
4 0
1y + 2x = 0 ⇒ -2x - 1y = 0
4x + 1y = 3 ⇒  <u>4x + 1y = 3</u>
                                <u>2x</u> = <u>3</u>
                                 2     2
                                  x = 1.5
                     4(1.5) + y = 3
                            6 + y = 3
                         <u>- 6        - 6</u>
                                  y = -3
                            (x, y) = (1.5, -3)
You might be interested in
Please help me with this! Thank you so much!
suter [353]

Answer:

\dashrightarrow \: { \tt{( \frac{3}{4}  -  \frac{8}{11} ) \div  \frac{1}{7} }} \\  \\ \dashrightarrow \: { \tt{ \frac{1}{44}  \div  \frac{1}{7} }} \\  \\ \dashrightarrow \: { \tt{ \frac{1}{44}  \times 7}} \\  \\\dashrightarrow \: { \tt{ \frac{7}{44} }}

6 0
3 years ago
Read 2 more answers
Justin wants to cover the top of his circular swimming pool to keep bugs out of the pool. The diameter of his pool is 20 feet. W
Leno4ka [110]

Answer:

Step-by-step explanation:Area of a circle is πr2

Diameter of the cover is 20feet

Radius= diameter/2

Radius= 20/2

Radius= 10 feet

Since 1feet = 0.3045m

Then 10feet =3.045m

Area= 3.142*3.045*3.045

Area= 29.133m2

4 0
3 years ago
Read 2 more answers
This year, a small business had a total revenue of $ 62 , 100. If this is 35 % more than their total revenue from the previous y
Olegator [25]

Answer:

$46000

Step-by-step explanation:

if x represents the previous years revenue, and they made 35% more than x, we need to find what 35% of x is and then add it to x to get the new total, so the equation becomes:

x + .35x = 62100

1.35x = 62100

x = 46000

4 0
3 years ago
Read 2 more answers
Can someone please help me? :(
miskamm [114]

Answer:

1, 2, 5

Step-by-step explanation:

All of those selections are more than 0.3

5 0
3 years ago
Read 2 more answers
2. The alkalinity of a fluid (pH) can be modeled in terms of its hydrogen ion concentration (H+, measured in moles/liter) of the
nataly862011 [7]

Given the equation:

pH=-log\mleft(H^+\mright)

You know that a lab technician finds that a sample of fluid has this pH:

pH=4.5

Then, in order to find the hydrogen ion concentration of the fluid, you need to follow these steps:

1. Substitute the pH given in the exercise into the equation:

4.5=-log(H^+)

Multiply both sides by -1:

-4.5=\log (H^+)

2. Solve for:

H^+

Remember that, by definition:

\log _b\mleft(c\mright)=a\Rightarrow b^a=c

In this case, you can identify that:

\begin{gathered} a=-4.5 \\ b=10 \\ c=H^+ \end{gathered}

Hence, substituting values and simplifying, you get:

\begin{gathered} b^a=c \\ 10^{-4.5}=H^+ \\ H^+=0.00003162278\text{ }\frac{moles}{liter} \end{gathered}

Therefore, the answer is:

H^+=0.00003162278\text{ }\frac{moles}{liter}

4 0
2 years ago
Other questions:
  • Evalúa 13-0{,}75w+8x13−0,75w+8x13, minus, 0, comma, 75, w, plus, 8, x cuando w=12w=12w, equals, 12 y x=\dfrac12x= 2 1 ​ x, equal
    12·1 answer
  • What is 22/4 +22/5x 15
    5·1 answer
  • What is equivalent to 2/9
    8·2 answers
  • Need help with this please
    11·1 answer
  • Which equation is in standard form and represents a line with slope 5 through the point (0, 2)?
    14·2 answers
  • How to find the Y intercept in a factored equation
    9·2 answers
  • Please help me. i am having a bit of trouble.
    6·2 answers
  • In a certain video game, players can create environments and populate them with a variety of characters. One player creates a ma
    11·1 answer
  • CAN SOMEONE HELP QUICK PLEASE, JUST WITH THE FIRST
    13·1 answer
  • The volume of a cylinder is given by the formula y = ²h, where r is the radius of the cylinder and h is the height.
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!