math
posted by neil hannit on .
solve for x and y when 5x3y2=0 and 7x+y=0.
Please this is sooo hard. no clue how to do it. please show me how to do it.

5x  3y = 2
7x + y = 0
Triple the last equation (both sides)
21x + 3y = 0
Add the first and third equations:
26x = 2
x = 1/13
5/13  3y = 2 = 26/13
3y = 21/13
y = 7/13