Solve for x and y:
We have,
…eq.1
…eq.2
Let us first simplify eq.1 & eq.2 by taking LCM of denominators,
Eq.1
⇒ 6x + 15y = 8 …eq.3
Eq.2
⇒ 18x – 12y = 5 …eq 4
To solve these equations, we need to make one of the variables (in both the equations) have same coefficient.
Lets multiply eq.3 by 18 and eq.4 by 6, so that variable x in both the equations have same coefficient.
Recalling equations 3 & 4,
6x + 15y = 8 [×18]
18x – 12y = 5 [×6]
⇒ 108x + 270y = 144
108x – 72y = 30
On solving these two equations we get,
⇒ 342y = 114
⇒
⇒
Substitute in eq.3/eq.4, as per convenience of solving.
Thus, substituting in eq.3, we get
6x + = 8
⇒ 6x + 5 = 8
⇒ 6x = 8 – 5
⇒ 6x = 3
⇒
Hence, we have and