Teachers and parrents

Instructions:

Solve a set of two equations with two unknowns and find out values of unknown variables x and y.

Example

9 . x - 18 . y=-54
-9 . x - 9 . y=27
=
=
=
x=
y=
Correctness test
9 . - 18 . =-54
-9 . - 9 . =27

Solution

9 . x - 18 . y=-54
-9 . x - 9 . y=27
x=-4
y=1

Solve exercises