00:01
So to solve for this, let us sign our variable with that x as the regular -sized coffee, and then our y as the large -sized coffee.
00:21
Now, based on the given, you know that the total number of coffees is 13.
00:26
That means we have x plus y is equivalent to 13.
00:30
And the total cost is the cost for...
00:36
Regular size coffee is 2, multiply the number of regular size coffee plus 3, y, because the total cost is 2 -2030.
00:47
So let's rearrange occasion 1, x is equivalent to 13 minus y.
00:54
So substituting 1 to equation 2, we will get 2, x, x again is 13 minus y as per equation 1, plus 3 y to 30.
01:11
So, so we're going for this, we have 2 times 13, it's 26.
01:17
Minus 2y, 3y...