How do you solve systems of equations using the substitution method?

1 Answer
Jun 15, 2018

Please see below.

Explanation:

I assume you are interested in linear equations. In general you need nn equations if you have nn variables.

Let us have 33 equations and 33 variables x,yx,y and zz. Now pick up an equation with xx and segregate it say xx in terms of y,zy,z. When we put this value of xx in two other equations we get two equations in yy and zz.

We can now find yy in terms of zz say using second equation and when we put in third equation we get value of zz.

Once zz is known, it is easy to find yy and then xx.