I am learning to solve simultaneous equations

I am learning to solve simultaneous equations

    x + 7y  = 15                      (8,1)                 1. inline your equations.
12x +20y =7                         ( y,x )                2. swap the x's and y's for the real numbers
                                                                       3.times the numbers that need to be
                        o no                                                 ( eg. 20y:20 times 1)
                        o yes                                        4. find out if it is a yes or a no

my next step is: to finish my goal faster and better.

I think I got to a solo level extended abstract because I got 100 on IXL, and I can solve simple simultaneous equations which I have to do to get the year 9 standard.