Do my math for me! D:< (Um, I mean, please help me?)
Posted by Duana Snow-Bit over 4 years ago
The three Math Idol judges have been eliminating contestants all day! The number of one-step equations and two-step equations who have been eliminated today is equal to 1150. If three times the number of one-step equations minus twice the number of two-step equations is equal to 1300, how many one-step equations auditioned today?
over 4 years ago uychiches replied:
Define your variables first. It always helps.
So.... x = 1150.
3y - 2x = 1300?
Is that right?
over 4 years ago Brady Banana-Neck replied:
Sounds about right.
I hate math.
But what do I do after that!?
3y - 2(1150) = 1300
Can you solve it from there?
I managed to get to 3y = 1300 + 2x, because you're supposed to isolate the y value, correct? So what now? I'm supposed to divide both sides by 3, right? But I can't do that... can I?
Well, if x = 1150 then 2x = 2300.
so 3y = 1300 + 2300.
3y = 3600
y = 1200
Just to check
3600 - 2300 = 1300.
... And so, 1300 is the answer?
no. Because you messed up saying x = 1150. x + y = 1150.
I don't understand why that is correct-- in words, what would that mean?
x = 1150 - y
3y - 2(1150 + y) = 1300
3y - 2300 + 2y = 1300
5y = 3600
y = 720
Now find x.