Question

By elimination method calculate this question
Given that x=-2,find the values of y and zfor the simultaneous equations
X+y-z=-1
x-2y+z=-7
Plzz help me

Answer 1

Answer:

X+y-z=-1

(-2)+y-z=-1

y-z=1-----(1)

x-2y+z=-7

(-2)-2y+z=-7

-2y+z=-5------(2)

add equation 1 and 2

y-z= 1

-2y+z=-5

-y=-4

y=4

put y =4 in 1

y-z=1

4-z=1

-z=-3

z=3

follow me and say thanks

Answer 2

Step-by-step explanation:

Given,

X = -2

So,

-2+y-z = -1

y-z = 1__________eq.1

-2-2y+z = -7

-2y+z = -5_______eq.2

eq.1________y-z = 1

eq.2_____-2y +z = -5

-----------------

-y = -4

So, y=4

From eq.1,

y-z=1

-z=1-4

z=3

Therefore, y=4 and z=3