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torisob [31]
3 years ago
13

If x + y = 12 and x = 2y, then x=

Mathematics
1 answer:
PIT_PIT [208]3 years ago
8 0

Answer:

y = 4

x = 8

Step-by-step explanation:

here's the solution :-

we know, x = 2y

so,

=》x + y = 12

=》2y + y = 12

( because x = 2y )

=》3y = 12

=》y = 12 ÷ 3

=》y = 4

so, y = 4

now,

=》x = 2y

=》x = 2 × 4

( because, y = 4 )

=》x = 8

so, we get x = 8

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Solve by using substitution. Express your answer as an ordered pair.
Deffense [45]

Answer:

(1, -2)

General Formulas and Concepts:

<u>Pre-Algebra</u>

Order of Operations: BPEMDAS

  1. Brackets
  2. Parenthesis
  3. Exponents
  4. Multiplication
  5. Division
  6. Addition
  7. Subtraction
  • Left to Right

Equality Properties

<u>Algebra I</u>

  • Solving systems of equations using substitution/elimination

Step-by-step explanation:

<u>Step 1: Define Systems</u>

4x + y = 2

y = x - 3

<u>Step 2: Solve for </u><em><u>x</u></em>

<em>Substitution</em>

  1. Substitute in <em>y</em>:                    4x + (x - 3) = 2
  2. Combine like terms:           5x - 3 = 2
  3. Isolate <em>x</em> term:                     5x = 5
  4. Isolate <em>x</em>:                              x = 1

<u>Step 3: Solve for </u><em><u>y</u></em>

  1. Define equation:                    y = x - 3
  2. Substitute in <em>x</em>:                       y = 1 - 3
  3. Subtract:                                 y = -2
7 0
3 years ago
Read 2 more answers
Seven prepsters each have 1/2 of a cady bar, how many candy bars do they have in all
madam [21]
7×1/2=7/2 or 3 1/2. As a result, they have total 3 1/2 candies. Hope it help!
3 0
3 years ago
Read 2 more answers
Solve the system of equations given below.<br> y - 15 = 3<br> -2.1 + 5y = -3
EastWind [94]

Answer:

1) y=18

2)y=-0.18

Step-by-step explanation:

1) y-15=3. Add 15 on both sides.

y=18

2)-2.1+5y=-3. Add 2.1 on both sides

5y=-0.9. Divide 5 on both sides

y=-0.18

3 0
3 years ago
Question;
AlladinOne [14]

Answer:

okay so I am assuming we are dividing okay so here is how we will do it

here are the top and bottom values written more easily

3^n -3^n-1

3^n+1 +3^n

so first we can cancel out the 3^n values then get left with this

3^n-1

3^n+1

now it depends on the instructions but you can leave it like this or you can subtract their powers to get

3^n-2

Step-by-step explanation:

8 0
3 years ago
What is the mZQPT? <br><br>P Q R S T <br>​
olasank [31]

Answer:

angle qpt equals 125

Step-by-step explanation:

QPT=60,RPS=45, and SPT=90-60=30

so its sum will be 125

3 0
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