Question

-4s+2t=-5
8s-6t=7
What is the value of s?

Answer 1

`-4s+2t=-5...........(1)\\8s-6t=7......(2)\\\\\text{Multiplying equation(1) by 3,}\\-12s+6t=-15.......(3)`

`\text{Adding equations (2) and (3),}\\\text{\ \ \ \ \ \ }8s-6t=7\\+-12s+6t=-15\\\text{or,\ }-4s=-8\\\text{or,\ }s=2`

`\text{So the value of }s\text{\ is 2.}`