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2 years ago

Can someone plz tell me the answers to these 3 questions!!! I’m so lost :(

Mathematics

1 answer:

Inga [223]2 years ago

5 0

1. (3,5)
2. (1,-3)
3. (3,10)

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a first number plus twice a second number is 4. twice the first number plus the second number totals 26. find the numbers

blagie [28]

Answer:

a = 16

b = -6

Step-by-step explanation:

a + 2b = 4

2a + b = 26

2a + 4b = 8

2a + b = 26

3b = -18

b = -6

a + 2(-6) = 4

a - 12 = 4

a = 16

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2 years ago

Please help ‼️‼️ i’ll give the brainliest thing if it’s correct

Rama09 [41]

This would be 85 use the percent in division

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1 year ago

Please help! Express 35 marks out of 40 as a percentage.

Blizzard [7]

Answer:

$\huge\boxed{\sf 87.5 \ \%}$

Step-by-step explanation:

35 marks out of 40 as a fraction:

35 / 40

As a percentage:

$\sf \frac{35}{40} * 100 \ \%\\\\0.875 * 100 \ \%\\\\87.5 \ \%\\\\\rule[225]{225}{2}$

Hope this helped!

7 0

2 years ago

What is the value of y in this system of equations: 3x + y = 9 y = –4x + 10 ?

Ahat [919]

3x + y = 9 (I)
y = –4x + 10 (II)
------------------------
 $\left \{ {{3x + y = 9 } \atop {y = -4x + 10 }} \right.$

Pass the incognito "4x" to the first term, changing the signal when changing sides.
-------------------------
simplify by (-1)
 $\left \{ {{3x + y = 9.(-1)} \atop {4x + y = 10 }} \right.$ 

-------------------------
 $\left \{ {{- 3x - \diagup\!\!\!\!y =-9} \atop {4x + \diagup\!\!\!\!y = 10}} \right. 
$

-------------------------
 $\left \{ {{- 3x = - 9} \atop {4x = 10}} \right.$ 

-----------
 $\boxed{x = 1}$ 

Substitute in equation (I) to find the value of "Y".

3x + y = 9 (I)
3*(1) + y = 9
3 + y = 9
y = 9 - 3
$\boxed{y = 6}$

Answer:
$\boxed{\boxed{ \left \ {{x=1} \atop {y=6}} \right. }}$

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2 years ago

Matherson made a wooden triangular pencil holder with an opening at the top. It has a height of 5 inches with the base being an

qwelly [4]

Answer:

Step-by-step explanation:

2.5 surface area

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2 years ago