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Firdavs [7]
3 years ago
5

Help and please explain (20 points, will reward brainliest :))

Mathematics
1 answer:
notka56 [123]3 years ago
7 0

Answer:x=13

BMC=75 degrees

Step-by-step explanation:

(x+2)+(5x+10)=90 degrees

so 6x+12=90

x=13

5x+10=5x13+10=75 degrees

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Y = 4x – 18<br> y = -5x +9
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Answer:

(3, -6)

General Formulas and Concepts:

<u>Pre-Algebra</u>

Order of Operations: BPEMDAS

  1. Brackets
  2. Parenthesis
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Step-by-step explanation:

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

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

<em>Substitution</em>

  1. Substitute in <em>y</em> [2nd Equation]:                                                                           4x - 18 = -5x + 9
  2. [Addition Property of Equality] Add 5x on both sides:                                   9x - 18 = 9
  3. [Addition Property of Equality] Add 18 on both sides:                                   9x = 27
  4. [Division Property of Equality] Divide 9 on both sides:                                  x = 3

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

  1. Substitute in <em>x</em> [1st Equation]:                                                                           y = 4(3) - 18
  2. Multiply:                                                                                                             y = 12 - 18
  3. Subtract:                                                                                                            y = -6
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