Question

What is the value of x in the solution to the following system of equations?

x − y = −3
x + 3y = 5

Answer 1

x=-1. You can get this if you use the elimination method, or substitution method.

Answer 2

solve for y in the first equation
and get y=-3+x
now plug into the 2nd equation

x+3(-3+x) = 5
x-9+3x=5
4x-9 = 5
4x=14
x= 14/4

Answer 3

and y=2, again, this can be achieved by elimination or substitution method.

Answer 4

oops made a mistake solving for y in the first equation gives you
y = x+3
and now plug that into 2nd equation
x+3(x+3) = 5
x+3x+9 = 5
4x +9 = 5
4x=-4
x= -1

Answer 5

x= 2x^2 + 4 / 5^2 - 264 + 3y / 7