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nataly862011 [7]
3 years ago
5

2x-5y=11 and -2x+3y=-9

Mathematics
1 answer:
Ede4ka [16]3 years ago
6 0
For this sys of equations, like all, we first have to solve for y or x in either equation
In this case, lets solve for y in the 2nd equation
-2x+3y=9
add 2x to both sides
3y=9+2x
divide 3 on both sides
y=2/3(x) + 3

now plug in y for the first equation
2x-5(2/3x)+3/11
simplify
-4/3(x) + 3=11
subtract 3 from both sides
-4/3x=8
multiply 3/4 on both sides
x= -6

now plug in x for either equation, lets do the first one again
2 (-6)-5y=11
-5y-12=11
add twelve to both sides
-5y=23
divide
y=-23/5

your final answer would be
x=-6, y=-23/5
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Mrs. Bryant's homeroom students are collecting boxtops. Each student is responsible for collecting 4% of the class's overall goa
galina1969 [7]

Answer:

Each student; 32

Kevin; 12

Step-by-step explanation:

4% of 800 is 32. Each student is responsible for colleting 32 box tops.

The next step is to figure out what 37.5% of the 32 is 12.

Hope that this helps! Have a good day and good luck!

8 0
3 years ago
If you could answer all of these that would be very helpful please help!!
Vlad [161]
0.75 is equal to 6\8
5.8 is > 4\5
a decimal greater than 5\8 is 1.2
0.2 > 1\4
0.7>0.6
a decimal smaller than 6\8 is 0.01
The one that is not equal to -7\5 is -11\5 
The answer is D 

3 0
3 years ago
Either enter an exact answer in terms of \piπpi or use 3.143.143, point, 14 for \piπpi and enter your answer as a decimal
timurjin [86]

Answer:

fefe efwe wefw efwffwee  ef ewwfwef we fwefwe we

Step-by-step  explanation:

fweef efwgfwe  r2323   fewerf wefwef23 ew2fefeff ej ufue f2343 4 343 433 3

7 0
3 years ago
Explain how you determine an equation for a line using a table of input/output values.
Lubov Fominskaja [6]
Example :

            x               y
            1               3
            2               6
            3               9
            4               12

first thing u do is pick any 2 points (x,y) from ur table

(1,3) and (2,6)
now we sub those into the slope formula (y2 - y1) / (x2 - x1) to find the slope
(y2 - y1) / (x2 - x1)
(1,3)....x1 = 1 and y1 = 3
(2,6)...x2 = 2 and y2 = 6
sub
slope = (6 - 3) / (2 - 1) = 3/1 = 3

now we use slope intercept formula y = mx + b
y = mx + b
slope(m) = 3
use any point off ur table...(1,3)...x = 1 and y = 3
now we sub and find b, the y int
3 = 3(1) + b
3 = 3 + b
3 - 3 = b
0 = b

so ur equation is : y = 3x + 0....which can be written as y = 3x...and if u sub any of ur points into this equation, they should make the equation true....if they dont, then it is not correct

and if u need it in standard form..
y = 3x
-3x + y = 0
3x - y = 0 ...this is standard form
6 0
3 years ago
Simplify the product using FOIL. (3x + 4)(2x – 6)
Arturiano [62]

Answer:

6x^2 - 10x - 24

Step-by-step explanation:

  1. Do 3x times 2x which is 6x^2
  2. Do 3x times - 6 which is -18x
  3. Do 4 times 2x which is 8x
  4. Do 4 times - 6 which is - 24
  5. You get 6x^2 - 18x + 8x - 24
  6. Simplyify to get the answer
5 0
4 years ago
Read 2 more answers
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