3 years ago

4x-5y=32 8x+5y=4 Please help me

Mathematics

1 answer:

antiseptic1488 [7]3 years ago

4 0

4x - 5y = 32

8x + 5y = 4

4x = 5y + 32 | : 4

8x + 5y = 4

x = 5/4y + 8

8(5/4y + 8) + 5y = 4

x = 5/4y + 8

10y + 64 + 5y = 4

x = 5/4y + 8

15y = -60 | : 15

x = 5/4y + 8

y = -4

x = 5/4 * (-4) + 8

y = -4

x = 3

y = -4

Testing:

4(3)-5(-4) = 32 | 12+20 = 32 : True

8(3)+5(-4) = 4 | 24-20 = 4 : True

Answer:

x = 3

y = -4

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