Inequalities Problem Set No. 1 pg 101, edition 4

[yuangeng]

If 4x-12>=x+9, which of the following must be true?
a. x>6
b x<7
c x>7
d x>8
e x<8

calculation ends up being x>=7, and answer says it's A, x>6. but shouldn't it be C, x>7? No where does it say x must be an integer, so 6.15 would not work.

[jnelson0612]

Please see this thread: query-from-equations-inequations-and-vic-strategy-guide-t12411.html