Teachers and parrents

Instructions:

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

Example

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

Solution

-18 . x - 18 . y=-54
-18 . x + 9 . y=-27
x=2
y=1

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