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xenn [34]
3 years ago
12

Find two numbers, if … d Their sum is − 1 3 and their difference is 18

Mathematics
1 answer:
natta225 [31]3 years ago
4 0

Answer:

The numbers are -15.5 and 2.5.

Step-by-step explanation:

Let the numbers be a and b.

a + b = -13

a - b = 18

Add the two equations.

2a = 5

a = 2.5

a - b = 18

2.5 - b = 18

-b = 15.5

b = -15.5

The numbers are -15.5 and 2.5.

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2x + 4y = 24<br> if y = -3<br> then x = ____?
natulia [17]

Answer:

x = 18

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

  • Multiplication Property of Equality
  • Division Property of Equality
  • Addition Property of Equality
  • Subtract Property of Equality

Step-by-step explanation:

<u>Step 1: Define</u>

2x + 4y = 24

y = -3

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

  1. Substitute in <em>y</em>:                     2x + 4(-3) = 24
  2. Multiply:                                2x - 12 = 24
  3. Isolate <em>x</em> term:                      2x = 36
  4. Isolate <em>x</em>:                               x = 18
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