Question

Given these equations x+y=9.0
0.50x+0.20y=4.05

Answer 1

When we solve these equations x= 7.5 and y= 1.5.

Answer 2

Explanation:

Given are two simultaneous equation in two variables x and y as

`x+y =9\\0.5x+0.2y = 4.05`

To solve this let us multiply second equation by 5

`x+y =9\\2.5x+y = 20.25\\----------------------\\-1.5x  =-11.25\\x = 7.5`

Substitute x value in I equation to get

`7.5+y =9\\y =1.5`

So solution set is

`x=7.5\\y=1.5`