2x-4y-14=04x+3y+20=-7

Question

2x-4y-14=0

4x+3y+20=-7

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Answer 1

{2х-4у=14 ||×(-2)
{4х+3у=-27

{-4х+8у=-28
{4х+3у=-27
сложим
4х-4х+3у+8у=-28-27
11у=-55
у=-5
2х-4×(-5)=14
2х+20=14
2х=-6
х=-3
(-3;-5)