In the equation 2x-3y = 10, y is expressed by an equation containing X

In the equation 2x-3y = 10, y is expressed by an equation containing X


Hello!
2x-3y=10
3y=2x-10
y=(2x-10)/3
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3x-y+2z=-1 2x+y-3z=9 x+y+z=-4


3x-y+2z=-1 (1)
2x+y-3z=9 (2)
x+y+z=-4 (3)
(1)+(2)
5x-z=8 (4)
(2)-(3)
x-4z=13 (5)
(4)-(5)*5
19z=-57
z=-3
x=1
y=-2



x+y+2z=5 2x-y-z=4 3x+y-3z=10


x+y+2z=5 ①
2x-y-z=4 ②
3x+y-3z=10 ③
①+②;3x+z=9 ④
②+③ 5x-4z=14 ⑤
4×④+⑤; x=50/17 ⑥
⑥ Substituting (4); Z = 3 / 17 (7)
⑥ (7) substituting (2); y = 29 / 17