Question

Help..Me..Please

10.) -5×+y=-3
3×-8y=24


11.) ×+3y=1
-3×-3y=-15



12.) -3×-8y=20
-5×+y=19

Answer 1

10. y: -5x+y= -3--> *3 = -15x+3y= -9 ---> -37y= 111
3x-8y= 24--> *5 = 15x+40y= 120 /-37 /-37 y= -3

10. x: -5x+y= -3--> *8 = -40x+8y= -24 ---> -37x= 0
3x-8y=24--> *1 = 3x-8y= -24 /-37 /-37 x= 0

11. y: x+3y=1--> *3 = 3x+9y= 3 ---> 6y= -12
-3x-3y=-15--> *1 = -3x-3y= -15 /6 /6 y= -2

11. x: x+3y=1--> *1 = x+3y= 1 ---> -2x= -14
-3x-3y=-15--> *1 = -3x-3y= -15 /-2 /-2 x= 7

12. y: -3x-8y=20 --> *-5 = 15x+40y= -100 ---> 43y= -43
-5x+y=19 --> *3 = -15x+3y= 57 ---> /43 /43 y= -1

12. x: -3x-8y=20 --> *1 = -3x-8y= 20 ---> -43x= 172
-5x+y=19 --> *8 = -40x+8y= 152 ---> /-43 /-43 y= -4