You can also be clever and do it with one equation and one unknown. Should get the same answer, though.You have two equations and two unknowns, substitue to solve for one variable in terms of the other, than solve the other eqaution.
What on Earth is a loonie?![]()
Canadian slang for a $1 coin. It has a picture of a loon (bird) on it.
Hey would you look at that I'm in Grade 9. Whoo.
Pretty much this:
.25x + 1y = 63.75
x + y = 114
Now do this:
4(.25x + y = 63.75)----------------------x + 4y = 255
1(x + y = 114)-------------------------x + y = 114 ------------------SUBTRACT
3y = 141
Divide both sides by 3
y = 47
x + 47 = 114
-47 -47
x = 67
Hope that makes sense. 👍
<?php
for ( $loonie = 114, $quarter = 0; 100 * $loonie + 25 * $quarter > 6375; $loonie--, $quarter++ )
;
printf( "%d loonies, %d quarters\n", $loonie, $quarter );
?>
Shouldn't you be doing you own homework, Z o n d a?![]()
You can also be clever and do it with one equation and one unknown. Should get the same answer, though.
That's what I was thinking. Give him a hint, at most. Why work it out for him? What's he gonna do the next time?
I think his problem isn't so much that he doesn't know how to work out a two-variable problem, I think he just couldn't translate the word problem into the math expressions. Word problems kill people, for some reason.
Yeah, that's generally what they do in class, while the kids are texting or Facebooking on their phones.
Or staring at tits.
Or legs, yes. We didn't have the internet in our pockets when I was distracted in school. With what we did have, you couldn't exactly look up what you were supposed to be learning. Kids got it so easy these days.