Question

-5x + 7 > 42 omg help please now
which oneee?
A. x > 245
B. x > -175
C. x > 7
D. x > -7

Answer 1

Add 5x to both sides:
7 > 5x + 42

Subtract 42 from both sides:
7 - 42 > 5x
-(42 - 7) > 5x
-(40 + 2 - 7) > 5x
-(33 + 2) > 5x
-35 > 5x

Divide both sides by 5
-35/5 > x
-7 > x

Answer 2

thinking of it his way might be easier --- get the same answer but
for a first step subract 7 from both sides to get

-5x > 35 which means 5 x's something is greater than 35....so it will have to be some kind of negative number because only -5 * some other negative number will be positive and any negative number would have to less then 35

divide both sides by 5 will get you -x > 7

to make it easier to read move the negative sign to the other side which changes the direction of the sign....x<-7 so any x that is less than -7 will work....check work will -10 work? yes done

Answer 3

I never agreed with the philosophy of dividing by negatives and flipping signs.

Answer 4

dude idk but which answer is it i dont get it

Answer 5

None of those answer choices are correct.

Answer 6

i think u r just wrong

Answer 7

@kantalope and I both got the same answer. x < -7

Answer 8

I usually don't go for reversing the signs either...but the opposite of the x that is bigger than 7 rough

Answer 9

so whats the answer lol?

Answer 10

@kantalope, do you agree with any of the answer choices?

Answer 11

a. won't work -1225 + 7 is not greater than 42
b. is no good 0 is more than -175 for instance and -5*0 + 7 is not greater than 42
c. won't work 10 is greater than 7 ...-5(10) = -50 + 7 = -43 that is not greater than 42
d. won't work either for the same reason that b won't work

Answer 12

if the sign is backwards on d...then d is exactly what @Hero and I have

Answer 13

@kantalope, none of the answer choices are correct. D is not correct.

Answer 14

as written none of the choices are correct