noaheault
29.03.2020 •
Mathematics
-2x + y = 0
-7x + 3y = 2
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Ответ:
x=2,y=-4
Step-by-step explanation:
-2x + y=0 eqn 1
-7x +3y=2 eqn 2
multiply eqn 1 by 3
-6x +3y=0 eqn 4
-7x +3y=2
subtract eqn 3 from eqn 4
-6x +3y=0
-(-7x +3y=2)
x=-2 eqn 5
substitute eqn 5 into eqn 2
-7(-2)+3y=2
14+ 3y=2
3y=2-14
3y=-12
divide both sides by 3
y=-4
Ответ: