Answer:
6. B
7. C
8. C
Explanation:
6.
3x
------- = 1.5 (x + 1)
x + 1 (x + 1)
3x = 1.5 (x + 1)
3x = 1.5x + 1.5
-1.5x -1.5x
1.5x = 1.5
x = 1
7.
2x + 3y = 15
(x + y = 3)-2
-2x - 2y = -6
----------------------
y = 9
x + y = 3
x + 9 = 3
-9 -9
----------------
x = -6
(x, y) = (-6, 9)
8.
(-4x + y = 4) -2
-8x + 2y = -2
8x - 2y = -8
--------------------
-10
No Solution
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