Add. 3x + 5y – z, –2x –y –z, 7x + 3y –z
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Step-by-step explanation:
8x+y-3z
Answered by
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2x + 3y + z = 9 ------(1)
5x - 5y - z = -29 ----(2)
3x + y + 3z = 9 -----(3)
Add equations (1) and (2) and eliminate z
7x-2y =-20 -----(4)
Multiply equation (2) by 3 and add it to equation (3); Eliminate z again.
15x-15y-3z = -87
3x+y+3z = 9
add:
18x-14y = -78 ----(5)
7x-2y =-20 -----(4)
18x-14y = -78 ----(5)
We may solve for x and y from (4) and (5)
Multiply equation (4) by -7
-49x+14y =140
18x-14y =-78
Add:
-31x = 62
x=-2 ---- x solved
plug this x into equation (4) and solve for y
7(-2)-2y=-20
-14 -2y = -20
-2y = -6
y=3 --- y solved
Plug x=-2 , y=3 into equation (1)
2(-2)+3(3)+z = 9
-4+9+z=9
z=4 --- z solved
x=-2
y=3
z=4
(now replace the numbers and add or subtract)
HOPE THIS HELPED YOU! (^^)
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