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scoray [572]
3 years ago
15

X-7=11 , 2x+y=19 when using elimination

Mathematics
1 answer:
12345 [234]3 years ago
6 0
X+0=18
2x+y=19 

(-2)x+(-2)0=(-2)18
2x+y=19 

0+y= -17 
2x+ (-17)=19
2x=36

y=-17
x=18
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PLEASE HELP FAST IF YOU ARE GOOD AT GEOMETRY:<br> AREA OF THESE SHAPES::
riadik2000 [5.3K]

Answer:

1)24  2)36  3)240

Step-by-step explanation:

1) area of triangle = 1/2b*h so 7*4=28  28/2=14

therefore area =24

2)9*4=36

3)15*16=240

3 0
3 years ago
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Klio2033 [76]

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8 0
3 years ago
The total number of seats in a movie theater is calculated by adding the area of the upper section given by 8x2 and the area of
e-lub [12.9K]
8x^2+6x^2+4x=138  combine like terms on left side

14x^2+4x=138 since the number of seats in the from row is just 4x, subtract 14x^2 from both sides

4x=138-14x^2  that would be the general solution, if you wanted the actual number you would have to solve for x and then multiply that value by 4 to know what "4x" is...

14x^2+4x-138=0

14x^2-42x+46x-138=0

14x(x-3)+46(x-3)=0

(14x+46)(x-3)=0

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So there are 12 seats in the front row addition.


3 0
3 years ago
What is the answer to this question
Gre4nikov [31]
It’s 4.08x10 to the 6 power. Which is answer A
6 0
3 years ago
Brainliest &amp; points!<br> i need help with math asap, show work too if possible :)
qwelly [4]

Answer:

I think the answer is x is 16 and y is 20? I could be wrong tho

Step-by-step explanation:

First, subtract -7 from -1 to get 8.

Then, add the 12 and you get 16 for x.

First, subtract 7y from 9x to get 2y

Then, add 4 to get 20 for y.

4 0
3 years ago
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