What are the x and y values of these linear equations?

Question

2x + y = 9

-x - y = - 8

- 3x + 4y = 2

- 2x - y = - 3

Answer 1

you do not get specific values, there are infinite number of solutions for each equations

2x + y = 9, y= -2x + 9

-x - y = - 8, y=-x+8

- 3x + 4y = 2, y = 3x/4 - 1/2

- 2x - y = - 3, y= -2x +3
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Answer 2

2x + y= 9
2x = 9-y
x = (9-y)/2
y= 9-2x

-x-y = -8
x + y= 8
x= 8-y y=8-x

-3x + 4y = 2
-3x = 2-4y
x= (2-4y)/-3
4y= 2 + 3x
y = (2 + 3x)/4

-2x - y= -3
-2x=-3 + y
x = (-3 + y)/-2
-y = -3 + 2x
y = 3 - 2x
These are linear equations, so the y is a depend ant variable, the x is the dependent variable. You cannot arrive at a numerical value for either without being given the numerical value of one.

Answer 3

One will get infinite # of values for X and Y.
To get definite values for a number of variables, there has to be two equations only.
So if you have 2 variables : # of equations should be 2
if 3 variables : # of equations should be 3 and so on and so forth. Then only you will get definite values.