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andrezito [222]

3 years ago

5

Solve the system of equation — 3х + бу = 9 5х + 7y = -49

1 answer:

agasfer [191]3 years ago

3 0

Answer:

y = 64/3

x = -119/3

Step-by-step explanation:

3х + 6у = 9 => 5*3x+5*6у = 9*5 => 15x+30у=45 (1)

5х + 7y = -49 => 3*5x + 3*7y = -49*3 => 15x+21y=-147 (2)

(1)-(2) => 9y = 192 => y = 64/3

x = -119/3

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