Question

solve using elimination method:
3x+11y=34.5
9x-7y=-16.5

Answer 1

3x + 11y = 34.5...................1
9x – 7y = -16.5...................2
..
multiply (1) by -3
-9x-33y=-103.5
add this to (2)
-7y-33=-16.5-103.5
-40y=-120
/-40

y =3
..
plug value of y in 1
3x+33=34.5
3x=34.5-33
3x=1.5
x=1.5/3
x=0.5

Answer 2

times the top by 3

---->
9x+33y=103.5
- 9x-7y=-16.5
----------------
0x +40y=120
40y=120
y=120/40
y=3

Answer 3

then plug in the value of 3 into one of the top equations, and you have your x value.

Answer 4

x=0.5
y=3