How do you solve the following system of equations?: #x+y= -2 , x-2y=13#?
2 Answers
Explanation:
since we have two unknowns we need minimum of two equations to solve for them , and we have that too
lets see the first equation
the first objective is to write either x in terms of y or y in terms of x
so i add -y to both sides , and we get
take this value of x and plug it in equation 2
so
this
becomes
solve for y to get a value
or
since we got y value , we can plug it back in the first equation to get x value
So ,
Explanation:
You add/subtract the two equations with each other, using the
would be the first equation. We can label it as equation
would be the second equation. We can label it as equation
Now, we can subtract equation
so
Now we can take
So