00:01
Okay, so you have 20 coins and then the coins that you have are nickels and quarters.
00:09
So we're going to let n and q be our letters here.
00:14
So n plus q equals 20.
00:17
And then we know that it's a total of $4.
00:23
So when we do money, we have to have money.
00:26
So nickels are worth $5 and quarters are worth $0 .25.
00:31
We need to write those as decimals.
00:34
So quarters would be 0 .25, nickels, 0 .05.
00:39
That's how we write that as money.
00:41
So our other equation would be our value of our nickels, which is 0 .05n plus 0 .25q, and that equals our value in money, which is $4.
00:54
And i know you just had to find your equation.
00:56
So those would be the two equations you would use.
00:59
But we're going to go ahead and solve it, just in case you also have to solve.
01:02
So we can do that several different ways.
01:04
I'm going to do it by substitution...