Answer:
18
General Formulas and Concepts:
<u>Pre-Algebra</u>
Order of Operations: BPEMDAS
- Brackets
- Parenthesis
- Exponents
- Multiplication
- Division
- Addition
- Subtraction
Step-by-step explanation:
<u>Step 1: Define</u>
4a - 2
a = 5
<u>Step 2: Evaluate</u>
- Substitute in <em>a</em>:                   4(5) - 2
- Multiply:                              20 - 2
- Subtract:                             18
 
        
                    
             
        
        
        
For the equation 
.. x - y = 4
you can divide by 4 to put the equation into intercept form. This form shows you both interecepts at once.
.. x/4 +y/(-4) = 1
The x-intercept is (4, 0).
The y-intercept is (0, -4).
The graph is shown below.
 
        
        
        
Answer:
(-3, -4).
Step-by-step explanation:
-4x + y = 8
x - 5y = 17           Multiply this by 4:
4x - 20y = 68     Add this to the first equation:
-19y = 76
y = 76/-19
y = -4.
Plug this into the second equation:
x - 5(-4) = 17
x = 17 - 20
x = -3.
CHECK this result in equation 1:
-4(-3) + -4 =  8
12 - 4 = 8
8 = 8  <------ OK.
 
        
             
        
        
        
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