Question

Solving by using elimination:
7x+4y=2
9x-4y=30

Answer 1

 7x + 4 y = 2
9x   - 4y= 30
-------------------
16x /   = 32
x= 32:16
x=2

7x+4y=2
7*2 + 4y=2
14 +4y=2
4y= 2-14
4y= -12
y= -12 : 4
y= - 3