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goldenfox [79]
3 years ago
9

X+2y=-1 and 4x-4y=20 solve by substitution

Mathematics
1 answer:
Illusion [34]3 years ago
8 0

To do this problem you would first need to factor out a variable, which in this case I would want to do the first equation because it is isolated. Now the equations would look like this:

x = -2y - 1

4x - 4y = 20

Since we know that x is now equal to -2y - 1 we can plug it in to the x value in the second equation:

4 (-2y -1) - 4y = 20

-8y -4 - 4y

-12y - 4 = 20

-12y = 24

y = -2

Now that we know the y value plug the y value to one equation to find the x, I will be using the first equation

x + 2(-2) = -1

x - 4 = -1

x = 3

Solutions:

y = -2

x = 3

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Lena [83]
X + x +8 = 32
2x + 8 = 32
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x = 12
So gerardo has won 12 and jenny has won 20
3 0
3 years ago
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alex41 [277]

Answer:

7:36

Step-by-step explanation:


4 0
3 years ago
HELP ME PLEASE HELP ME HELP ME PLEASE
riadik2000 [5.3K]

Answer:

<h2>     no, because the remainder is 126</h2>

Step-by-step explanation:

if x+3 is a factor, then -3 is a root of expression, and the remainder would be 0

calculating remainder:

-3(-3)^3+6(-3)^2+6(-3)+9=-3\cdot(-27)+6\cdot9-18+9=\\\\=81+54-9=126

4 0
3 years ago
-<br> бх + 7(1-x) = -4(x-4) ​
enyata [817]
6x + 7(1-x) = -4(x-4)
6x + 7 - 7x = -4x + 16
-x + 7 = -4x + 16
-x + 4x = 16 - 7
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x =9/3
x = 3
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3 years ago
NEED HELP ASAP 30 POINTS
klemol [59]
30 is the answer. You do 10X 3 which is 30- 2 which is 28 and 28 to the nearest 10th is 30
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