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se despeja una variable,despejaremos x...en ambas ecuaciones y se despues se iguala para encontrar y
3x-2y=-2
5x+8y=-60
3x-2y=-2 ...3x=-2+2y....x=-2+2y
3
5x+8y=-60....5x=-60-8y...x=-60-8y
5
-2+2y=-60-8y= 5(-2+2y)=3(-60-8y)...-10+10y=-180-24y...10y+24y=-180+10
3 5
34y=-170...y=-170/34....y=-5
si y=-5 entonces x=-4
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7x-4y=5
9x+8y=13
7x-4y=5...7x=5+4y....x=5+4y
7
9x+8y=13..9x=13-8y....x=13-8y
9
5+4y=13-8y ...9(5+4y)=7(13-8y)...45+36y=91-56y....36y+56y=91-45
7 9
92y=46....y=46/92....y=1/2
si y=1/2 entonces x=1
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9x+16y=-7
4y-3x=0
9x+16y=-7....9x=-7-16y...x=-7-16y
9
4y-3x=0...-3x=0-4y....x=-4y
-3
-7-16y =-4y ...-3(-7-16y)=9(-4y)....21+48y=-36y...48y+36y=-21
9 -3
84y=21...y=-21/84....y=-1/4
si y=-1/4 entonces x=-1/3
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3x+5y=7
2x+y=4
3x+5y=7...3x=7-5y...x=7-5y
3
2x+y=4...2x=4-y...x=4-y
2
7-5y=4-y ...2(7-5y)=3(4-y)...14-10y=12-3y...-10y+3y=12-14
3 2
-7y=-2....y=-2/-7........y=2/7
si y=2/7 entonces x=13/7