Consider the simultaneous equations below
5x + 2y  = 9  (1)

9x  7y  = 5.  (2) 
Which of the following are the correct steps to eliminate
x from the equations?
Not correct. Choice (a)
is false.
Try again, this
eliminates y .
Your answer is correct.
This then gives us
45x + 18y  = 81  

45x  35y  = 25.   
When we subtract one from the other we get 53
y = 106 and
y = 2
.
Not correct. Choice (c)
is false.
Try again, you seem to be
trying to eliminate y .
Not correct. Choice (d)
is false.
Try again, this would not eliminate x but give us 90x  17y = 56.