<PRE><B>Question 1169747</B>
solve the following pair of simultaneous equations.
3/5x - 4y = -1
0.8x - 3.5y = 1/2
Get rid of these annoying numbers, multiply both eq by 10
6x - 40y = -10
8x - 35y = 5
multiply 1st eq by 8, the 2nd eq by 6
48x - 320y = -80
48x - 210y = 20
------------------subtraction eliminates x, find y
0 - 110y = -100
multiply by -1
110y = 100
y = 100/110
y = {{{10/11}}}
find x 
8x - 35({{{10/11}}} = 5
8x - {{{350/11}}} = 5
8x = {{{55/11}}} + {{{350/11}}}
8x = {{{405/11}}}
x = {{{405/88}}}
:
:
Check using the 2nd original equation, using a calc
.8({{{405/88}}}) - 3.5({{{10/11}}}) = .5
</PRE>