Mathematics: X+y=11 x-y=-5 Please anyone help?

Assuming this question is about total costs in an economics term then this is fixed costs + variable costs in whichever currency is being talked about.....

X+y=11 x-y=-5 Please anyone help? - id11513537400, oryunnis

Ответ:

leslop

27.06.2021

Mathematics

x=3

y=8

Step-by-step explanation:

The process of elimination is a method of solving a system of equations. This process includes manipulating a system of equations such that one variable present in both equations has its coefficients as additive inverses. When one adds the equation, this variable will cancel, one can solve for the other variable using inverse operations, and then back solve for the eliminated variable.

$\left \{ {{x+y=11} \atop {x-y=-5}} \right.$

As one can see, the coefficients of variable (y) are already additive inverses of each other (1), (-1), therefore, one can add the systems right away.

$\left \{ {{x+y=11} \atop {x-y=-5}} \right.$

(x)+(y)+(x)+(-y)=(11)+(-5)