Question

alguien me ayuda a resolver esto xfavor ​

Answer 1

1)

$X+2Y=7\qquad2X-Y=4\\\\2X=2(7-2Y)\qquad 2X=4+Y\\\\14-4Y=4+Y\\\\10=5Y\\\\Y=2\qquad X=3$

2)

$3X+5Y=-29\qquad\qquad\qquad\quad2X+3Y=-18\\\\3X=-29-5Y\qquad\qquad\qquad\quad2X=-18-3Y\\\\-2(3X)=-2(-29-5Y)\qquad-3(2X)=-3(-18-3Y)\\\\-6X=58+10Y\qquad\qquad\quad\quad-6Y=54+9Y\\\\58+10Y=54+9Y\\\\Y=-4\qquad X=-3$