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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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In the diagram above z1 =2x+20 and z2 =3x+10. Find the measure of z1.
alex41 [277]

Answer:

40

Step-by-step explanation:

Angle 1 and 2 are alternate angles

Then they are equal

2x+20=3x+10

Solve for x

X=10

Then 2 (10)+20 =40

5 0
3 years ago
Plz help I’ll give brainliest
Elden [556K]
2. 17

3. 8

Hope this helps!
5 0
3 years ago
Read 2 more answers
A- CE=CD <br> B- CE = CA <br> C- BF=DF <br> D- DF=EF<br><br> please help!!
Oksana_A [137]

The perpendicular bisector theorem gives the statements that ensures

that \overleftrightarrow{FG} and \overleftrightarrow{AB} are perpendicular.

The two statements if true that guarantee  \overleftrightarrow{FG} is perpendicular to line \overleftrightarrow{AB} are;

  • \overline{CE} = \overline{CD}
  • \overline{DF} = \overline{EF}

Reasons:

The given diagram is the construction of the line \mathbf{\overleftrightarrow{FG}} perpendicular to line \mathbf{\overleftrightarrow{AB}}.

Required:

The two statements that guarantee that  \overleftrightarrow{FG} is perpendicular to line \overleftrightarrow{AB}.

Solution:

From the point <em>C</em> arcs <em>E</em> and <em>D</em> are drawn to cross line \overleftrightarrow{AB}, therefore;

\overline{CE} = \mathbf{\overline{CD}} arcs drawn from the same radius.

\overleftrightarrow{FG} is perpendicular to line \overleftrightarrow{AB}, given.

Therefore;

\overline{DF} = \overline{EF}  by perpendicular bisector theorem.

Learn more about the perpendicular bisector theorem here:

brainly.com/question/11357763

7 0
3 years ago
ANSWER ASAP 20 POINTS AND GIVE EXPLANATION
enot [183]

Answer:

Option 2

Step-by-step explanation:

Given

B = (-6,1)

B' = (-3,-2)

Step 1: Substitute the original and translated coordinates into (x,y) => (x+a,y+b)

B(-6,1) => B'(-6+a , 1+b) = B'(-3,-2)

Step 2: Write two equations

-6+a = -3 => a = -3+6 = 3

1+b=-2 => b = -2-1 = -3

Hence, we can conclude that Indira wrote the equations wrong which was her first error.

Therefore, Option 2 is correct ..

7 0
3 years ago
PLEASE HELP ME OUT !!! WILL APPRECIATE IT SO MUCH !!
mash [69]
Start with the general formula. The key word is difference. So the general formula is 

D(x) = W(x) - R(x) Now substitute in the values for W(x) and R(x)
D(x) = 0.002x^3 - 0.01x^2 - (x^2 - 4x  + 13) Be very careful about the sign in front of the brackets.

D(x) = 0.002x^3 - 0.01x^2 - x^2 + 4x - 13 Do you see what that minus sign did? It affected all 3 terms.

D(x) = 0.002x^3 - 1.01x^2 + 4x - 13 <em>Note: -0.01 - 1x^2 = - 1.01 x^2</em>
That gives you a clear cut answer

C<<<<< answer.

That sign is the worst part of the question. Make sure you understand what it did.
4 0
3 years ago
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