All categories

2 years ago

Plz help, explain me the methodTopic: Simultaneous equationsClass 9 ICSE

Mathematics

2 answers:

sergeinik [125]2 years ago

8 0

Answer:

heyy matee...

going according to given parameters

let 2 numbers be x and y

so atq =>

3x + y = 142 => y = 142 - 3x

and 4x - y = 148

4x - ( 142 - 3x ) = 138

4x - 142 + 3x = 138

7x = 280

x = 40

now y = 142 - 3(40) = 142 - 120 = 22

so x = 40 and y = 22

aliina [53]2 years ago

3 0

Answer:

Hope so, it helped you.

Step-by-step explanation:

For solving the equation i elimanated y by adding both the equation.

You might be interested in

PLS HELP the LAST QUESTION, please...

Alex73 [517]

Answer:

280 Cubic inches

Step-by-step explanation:

When finding the volume, the equation is V=l*w*h

Therefore, the equation should be:

10.1*3.9*6.8

This is equal to exactly 267.852

However, the answer is 280 cubic in. because it's a larger number and it's about 13 from the actual answer. On the other hand, 250 cubic in. is about 17 from the actual number.

7 0

2 years ago

Evaluate-2x3 - 2x2 - 4x-2 for x=-2. A.-18 B. 16 C. -2 D. 14

dmitriy555 [2]

Answer:

Step-by-step explanation:

-2x^3 - 2x^2 - 4x-2

Let x = -2

-2 (-2)^3 - 2 (-2)^2 -4(-2) -2

Exponents first

-2 (-8) -2 (4) -4(-2) -2

Then multiply

16 -8 +8 -2

Then add and subtract

4 0

2 years ago

What are three equivalent ratios for 5/45

Burka [1]

$\frac{5}{45}=5:45\ and\ \frac{5}{45}=\frac{5:5}{45:5}=\frac{1}{9}\\\\\frac{5}{45}=\frac{1}{9}\to\boxed{1:9}\\\\\frac{5}{45}=\frac{1}{9}=\frac{1\cdot2}{9\cdot2}=\frac{2}{18}=\boxed{2:18}\\\\\frac{5}{45}=\frac{1}{9}=\frac{1\cdot3}{9\cdot3}=\frac{3}{27}=\boxed{3:27}\\\\\frac{5}{45}=\frac{1}{9}=\frac{1\cdot4}{9\cdot4}=\frac{4}{36}=\boxed{4:36}\\\vdots$

7 0

2 years ago

V = u + at u = 2 and a= -5 and t= 1/2 work out the value of v

Darina [25.2K]

Step-by-step explanation:

v=u+at

v=2+(-5)1

2

v=2-2.5

v=-0.5m/s²

hope it helps.

8 0

2 years ago

Read 2 more answers

April has 95 baseball cards.She wants to organize them on pages that hold 18 cards each. She has 5 pages. Does April have enough

gulaghasi [49]

Hello,

we must multiply the number of pages by the number of cards that hold each page to find the total number of card that she can organize, so:

5*18=90

She can organize 90 cards, but she has 95, then SHE DOESN'T HAVE ENOUGHT PAGES TO ORGANIZE THEM.

8 0

2 years ago

Read 2 more answers

Plz help, explain me the methodTopic: Simultaneous equationsClass 9 ICSE​

Plz help, explain me the methodTopic: Simultaneous equationsClass 9 ICSE