Question

4z + 2x - 5y = 10x-5z If 3x + y = 26 And z = 9; what is y? ​

Answer 1

Answer:

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

4z+2x-5y-10x+5z=0

-8x-5y+9z=0

8x+5y-9z=0------(1)

"z=9" z substitute in equation 1

8x+5y-9(9)=0

8x+5y-81=0

8x+5y=81----(2)

3x+y=26-----(3)

substrate 2&3

8x+5y=81

3x+y=26*5

8x+5y=81

15x+5y=130

=-7x=-49

x=7

x substitute in equation 3

3(7)+y=26

21+y=26

y=26-21

y=5

Answer 2

Step-by-step explanation:

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

10x - 2x + 5y - 5z - 4z = 0

8x + 5y - 9z = 0 --------(1)

3x + y = 26

y = 26 - 3x --------(2)

z = 9 ---------(3)

from equations (1) , (2) & (3)

we get,

8x + 5(26 - 3x ) - 9(9) = 0

8x + 130 - 15x - 81 = 0

-7x + 49 = 0

7x = 49

x = 7

from equation (2)

we get,

y = 26 - 3(7)

y = 26 - 21

y = 5