Question

halle el valor de las incognitas que satisfacen las ecuaciones aplicando el metodo de sistitucion
$\left \{ {x+3y=6} \atop {5x-2y=12} \right.$
$\left \{ {5x+7y=-1} \atop {-3x+4y=-24} \right.$
$\left \{ {4y+3x=8} \atop {8x-9y=-17} \right.$
$\left \{ {x-5y=8} \atop {-7x+8y=25} \right.$
$\left \{ {15x+11=32} \atop {7y-9x=8} \right.$
$\left \{ {10x+18y=-11} \atop {16x-9y=-5} \right.$
ayudeme xf es para hoy :3

Answer 1

X=6-3y

5(6-3y)-2y=12
30-15y-2y=12
-15y-2y=12-30
-17y=18
Y=18/-17

X=6-3y
X=6-3•18/-17
X=6+54/17
X=156/17
——————————
X=-1-7y/5

-3(-1-7y/5)+4y=-24
3+21y/5+20y/5=-120/5
3+21y+20y=-120
21y+20y=-120-3
41y=-123
Y=-123/41
Y=-3

X=-1-7y/5
X=-1-7•(-3)/5
X=-1+21/5
X=20/5
X=4
———————

3x+4y=8
8x-9y=-17

X=8-4y/3

8(8-4y/3)-9y=-17
64-32y/3-27y/3=-51/3
64-32y-27y=-51
-32y-27y=-51-64
-59y=-115
Y=-115/-59
Y=115/59
———————
X=8+5y
-7(8+5y)+8y=25
-56-35y+8y=25
-35y+8y=25+56
-27y=81
Y=81/-27
Y=-3

X=8+5y
X=8+5(-3)
X=8-15
X=-7
———————-
15x=32-11
15x=21
X=21/15
X=7/5

Y=25+7x/8
Y=25+7•7/5/8
Y=25+49/5/8
Y=125/5+49/5/8
Y=174/5/8
—————————
X=-11-18y/10

16(-11-18y/10)-9y=-5
-176-288y/10-90y/10=-50/10
-176-288y-90y=50
-288y-90y=50+176
-378y=226
Y=226/-378
Y=-113/189