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Nutka1998 [239]
3 years ago
11

Solve each system of linear Equations x+y=5 x-3y=3

Mathematics
1 answer:
JulijaS [17]3 years ago
7 0
X+y=5     y=5-x

x-3y=3
x-3(5-x)=3
x-15+3x=3
4x=18
x=4.5

y=5-x
y=0.5

check
x+y=5          4.5+0.5=5
x-3y=3         4.5-1.5=3
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Answer:

f(3) = -17

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
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Step-by-step explanation:

<u>Step 1: Define</u>

f(x) = -5x - 2

f(3) is x = 3

<u>Step 2: Evaluate</u>

  1. Substitute in <em>x</em>:                    f(3) = -5(3) - 2
  2. Multiply:                               f(3) = -15 - 2
  3. Subtract:                              f(3) = -17
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