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butalik [34]
3 years ago
14

Solve the given system by the substitution method. 3x + y = 8 7x - 4y = 6​

Mathematics
2 answers:
timofeeve [1]3 years ago
4 0

Answer:

{ \tt{y = 8 - 3x}} -  -  - (i) \\  \\  =  > 7x - 4(8 - 3x) = 6 \\ 7x - 32 + 12x = 6 \\ 19x - 32 = 6 \\ 19x = 38 \\ x = 2 \\  \\  =  > y = 8 - 3(2) \\ y = 2

Andreyy893 years ago
3 0
3x+y=8, so
y=8-3x (rearranged)

7x-4y=6
7x-4(8-3x)=6 (substitute the value of y with 8-3x)
7x-32+12x=6
19x=38
x=2

y=8-3(2)
y=2
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Step-by-step explanation:

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