Question

Solve 3x - 7 > 5 or 2x + 6 < 12.

A. 3 < x < 4
B. -2/3 < x < 9
C. x > 4 or x < 3
D. no solution
@mtbender74 :)

Answer 1

pls help :)

Answer 2

C. x < 3 || x > 4

Answer 3

um.. thx

Answer 4

Your welcome.

Answer 5

:)

Answer 6

for 3x - 7 > 5, then 3x > 12, then x > 4.
for 2x + 6 < 12, then 2x < 6, then x < 3
so, 4 < x < 3.
No solution.

Answer 7

From Mathematica Home Edition:\[\text{Reduce}[-7+3 x>5\|6+2 x<12]\to x<3\|x>4 \]

Answer 8

@robtobey is right. I missed the 'or'

Answer 9

antoniodingyi,

If you were right, Wolfram Research, would have been very interested in your proof.

Answer 10

robtobey, ha. ha. :)