00:01
For this question, we have to check some points to see if they are a solution to a given system.
00:08
So we got 3x plus y, 2x minus y, first one is greater than 5, the second one is less than an equal to 10.
00:20
So for part a, we're checking 3, negative 3.
00:30
So basically this is just done through substitution.
00:33
So let's scroll down a little bit.
00:35
We've got to plug in for the first function, 3 times 3.
00:40
Plus y which is negative 3 is greater than 5 this is 9 minus 3 which is greater than 5 this does check out so that's a good sign but it has to work for both of the functions so we have to double check on the other side that it fits into the second equation as well 2 times 3 minus negative 3 be careful with the double negative is less than equal to 10 so this is 6 plus 3 equal to 10 that is 6 plus that are equal to 10 that does work out that's nine.
01:13
So this first one, i guess it's green checkmark.
01:16
This is a solution.
01:20
We'll do the same thing for part b...