Respuesta:
x = 3
y = 4
Explicación paso a paso:
x - 3y = -9
x + y = 7
-4y = -16
y = -16/-4
Reemplazar para hallar x
x + 4 = 7
x = 7 - 4
x-3y=-9
3y=9-x
y=-(-9-x)/3
x+y=7
[tex]x+(-\frac{-9-x}{3}) =7[/tex]
[tex]x-\frac{-9-x}{3}=7[/tex]
[tex]-\frac{x-9-x}{3}+\frac{x*3}{3}=7[/tex]
[tex]\frac{-(-9-x)+x*3}{3}=7\\[/tex]
[tex]\frac{9+4x}{3}=7[/tex]
[tex]\frac{9}{3}+\frac{4x}{3} =7[/tex]
[tex]3+\frac{4x}{3}=7[/tex]
[tex]3*3+\frac{4x}{3}*3=7*3[/tex]
9+4x=21
4x=12
x=3
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Verified answer
Respuesta:
x = 3
y = 4
Explicación paso a paso:
x - 3y = -9
x + y = 7
-4y = -16
y = -16/-4
y = 4
Reemplazar para hallar x
x + y = 7
x + 4 = 7
x = 7 - 4
x = 3
x-3y=-9
3y=9-x
y=-(-9-x)/3
x+y=7
[tex]x+(-\frac{-9-x}{3}) =7[/tex]
[tex]x-\frac{-9-x}{3}=7[/tex]
[tex]-\frac{x-9-x}{3}+\frac{x*3}{3}=7[/tex]
[tex]\frac{-(-9-x)+x*3}{3}=7\\[/tex]
[tex]\frac{9+4x}{3}=7[/tex]
[tex]\frac{9}{3}+\frac{4x}{3} =7[/tex]
[tex]3+\frac{4x}{3}=7[/tex]
[tex]3*3+\frac{4x}{3}*3=7*3[/tex]
9+4x=21
4x=12
x=3