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Ann [662]
3 years ago
11

Solve each system by substitution.

Mathematics
1 answer:
jek_recluse [69]3 years ago
4 0
-8x + 4y = 20
-8x = 20 - 4y

Subtitute -8x with 20-4y
-8x + 7y = 5
(20-4y) + 7y = 5
20 + 3y = 5
3y = 5 - 20
3y = -15
y = -15/3
y = -5

Find x
-8x = 20 - 4y
-8x = 20 - 4(-5)
-8x = 20 + 20
-8x = 40
x = 40/-8
x = -5
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</span>_________________________________________________________

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      In an expression with 2 (TWO) terms;  that is, in a "binomial expression", 
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To find the "conjugate" of the given binomial expression:

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</span>→  {that is:  " √x − 2√b " ;  is the conjugate.}.
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