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Drupady [299]
3 years ago
8

2.7x -9 = x +7.5 need the answer can't find solution.

Mathematics
2 answers:
Montano1993 [528]3 years ago
6 0

Answer:

x = 9.7

Step-by-step explanation:

2.7x -9 = x +7.5

2.7x - x = 7.5 + 9

1.7x = 16.5

x = 16.5/1.7

x = 9.7

andrew11 [14]3 years ago
6 0

Answer:

x = 9.70588

General Formulas and Concepts:

<u>Pre-Algebra</u>

  • Order of Operations: BPEMDAS
  • Equality Properties

Step-by-step explanation:

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

2.7x - 9 = x + 7.5

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

  1. Subtract <em>x</em> on both sides:                    1.7x - 9 = 7.5
  2. Add 9 on both sides:                           1.7x = 16.5
  3. Divide 1.7 on both sides:                     x = 9.70588

<u>Step 3: Check</u>

<em>Substitute in x into the original equation to verify it's a solution.</em>

  1. Substitute in <em>x</em>:                    2.7(9.70588) - 9 = 9.70588 + 7.5
  2. Multiply:                               26.2059 - 9 = 9.70588 + 7.5
  3. Subtract/Add:                      17.2059 = 17.2059

Here we see that 17.2059 does indeed equal 17.2059.

∴ x = 9.70588 is a solution of the equation.

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Step-by-step explanation:

a) Dividing the moviment into two parts:

I - With acceleration

v = v₀ + at

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b) Dividing the moviment into two parts:

I - With acceleration

v = v₀ + at

s = s₀ + v₀t + at²/2

  • v₀ = 0
  • s₀ = 0
  • a = ?
  • v = ?
  • t = 3s
  • s = x

v = v₀ + at

v = 3a ⇒ a = v/3

s = s₀ + v₀t + at²/2

x = v/3.3²/2

x = 3v/2

II - Uniform

s = s₀ + vt

s = 200

s₀ = x

v = v

t = 19.30 - 3 = 16.30s

s = s₀ + vt

200 = x + v*16.3

100 = x + 16.3v

As x = 3v/2

200 = 3v/2 + 16.3v

200 = 1.5v + 16.3v

200 = 17.8v

v = 11.24m/s

a = v/3 = 3.75 m/s²

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