Question

Como faz gente?
{x+3y=1->x=
{5x+3y=17

Answer 1

x+3y=1 x(-3)

5x+3y=17
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-3x-9y=-3

5x+3y=17
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2x=14∴

x=14/2∴
x=7∴

7+3y=1
3y=1-7
3y=-6
y=-6/3

y=-2