Question

solve system of equation:
x+y=-1
y-z=4
2x+y+5z=-38
i need step by step help please?

Answer 1

ok...

take the 2nd equation

y - z = 4 and multiply it by 5

so you get

5y - 5z = 20

now add it to the last equation this will eliminate z

5y - 5z = 20

2x + y + 5z = -38
------------------

2x + 6y = -18

now you have 2 equations in 2 unknowns... which is easier to solve

you can divide the equation by 2 to make easier

x + 3y = -9

and

x + y = -1

a little subtraction

x + 3y = -9
-x - y = 1
-------------
2y = -8

so y = -4

substitute the value of y into the 1st equation to find x

x - 4 = -1

when you have x

substitute your value of y into the 2nd equation to find z

-4 - z = 4

hope this helps

Answer 2

okay thanks

Answer 3

and z is equal t0 7 corretc?

Answer 4

@campbell_st

Answer 5

no I think z = -8

Answer 6

and x is 3 correct?

Answer 7

yep... I think thats it

Answer 8

thank yo so much. You work fast :)