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Fernando Conrad
Mathematics
14 December, 00:59
7x - 3y = 20
y = 5 х - 4
x=
y=
+4
Answers (
1
)
Hernandez
14 December, 01:20
0
x = - 1
y = - 9
Step-by-step explanation:
7x - 3y = 20
7x - 3 (5 х - 4) = 20
7x - 15x + 12 = 20
-8x = 20 - 12
x = 8/-8
x = - 1
7x - 3y = 20
7 (-1) - 3y = 20
-7 - 3y = 20
-3y = 20 + 7
-3y = 27
y = 27/-3
y = - 9
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