2x -9y = 14
x = -6y + 7
first replace the x of the first equation with the -6y + 7
which turns out
2 ( -6y + 7 ) -9y = 14
by following brackets first rule we can do
- 12y + 14 -9y = 14
we can arrange the following to
- 12y - 9y + 14 = 14
so like terms are together
we shifting 14 over
- 12y - 9y = 14 - 14
- 21y = 0
meaning y = 0
then we can replace x = -6y + 7 with
x = -6 (0) + 7
by multiplying with brackets first rule we come to
x = 0 + 7
x = 7
