#3, you have an infinite number of solutions if, while you are solving, the variable drops out, and you end up with a true statement.
your choice:
3/x + 2/x = 1
multiply each term by x
3 + 2 = x
x = 5, one solution, so, wrong choice.
correct answer:
4x/12 = 3x/9
x/3 = x/3
x/3 - x/3 = 0
0 = 0 , the variable disappeared and 0=0 is true
In #4, choice A and C are the same thing
B and D are incorrect
Help would be great, it is for a "test" to see what we know, so it is not worth anything but I still would like to see if I can make changes to it before I submit it. :D
3.) Select the equation that has infinitely many real solutions. (these are all fractions btw)
A.)10/x=20/x+20
B.)3/x=2/x+1<--what I chose.
C.)3/4=2/x+1
D.)4x/12=3x/9
4.) Janice works at Red Robin and earns $70 per day plus tips which is equal to about 15% of the total amount of sales of food, s. Janice earns less than $200 total on Monday. Select all the inequalities that represent all possible values for the waitress’s sales, s, on Monday. (sorry for all of that, I had to hand type it all xD)
A.)200>70+0.15s <-- I went with all but D.)
B.)200<70+0.15s <--
C.)70+0.15s<200 <--
D.)200>70+15s
That is all for now, thank you for your assistance. :D
1 answer