Hello, can someone help me sovle these, i know the gaussian and substitution methods but the coefficients in these equations are all proportional so when i multiply up to cancel out it removes all Xs and all Ys, any suggestions are welcome, it's probably really simple and i'm missing something, thanks guys.
thanks again .
You're not missing a thing.
. . The system does not have a unique solution.
10x + 2y .= .8 . 
15x + 3y .= 12 -
Divide  by 2: .5x + y .= .4
Divide  by 3: .5x + y .= .4
You see, they gave us only one equation.
And one equation with two variables has an infinite number of solutions.
It says: "Find two numbers x and y so that 5 times x plus y equals 4"
. . and there are zillions of answers: .(1,-1), (0,4), (-1,9), . . .