QUESTION
Solve the following equations for X and Y, if 3X − Y =
SOLUTION
Given equations are
3X – Y =
and X – 3Y =
By (i) x 3 – (ii), we get
8X =
=
=
∴ 8X =
∴ X =
∴ X =
=
By (i) – (ii) x 3, we get
8Y =
=
=
∴ 8Y =
∴ Y =
=
=
Solve the following equations for X and Y, if 3X − Y =
Given equations are
3X – Y =
and X – 3Y =
By (i) x 3 – (ii), we get
8X =
=
=
∴ 8X =
∴ X =
∴ X =
=
By (i) – (ii) x 3, we get
8Y =
=
=
∴ 8Y =
∴ Y =
=
=