Answer:
The only methods allowed are
- "Subtract equation 2 from equation 1," and "Multiply equation 1 by 2. Then add the new equation to equation 2"
-
Step-by-step explanation:
Subtract Eq 2 from Eq 1:
3x-2y=7
-3x-4y=-17
-6y = -10
y = (5/3)
Use y =(5/3) to solve for x in both equations.
x=(31/9)
Subtract the left side of equation 2 from the left side of equation No, this is not a legal operation.
Multiply equation 1 by 2. Then add the new equation to equation 2 Yes, this works. Instead of solving for y first, this method solves for x, which can then be used to find y:
2(3x-2y=7)
6x-4y=14
3x+4y=17
9x = 31 (y is eliminated)
x = (31/9)
Now use this to find y in either equation:
3x-2y=7
3x-2(31/9)=7
y = (5/3)
