00:03
To solve the system of equations using substitution, let's rewrite the second equation so that it is solved explicitly for x.
00:11
To get x by itself, let's add y to both signs.
00:16
Now our second equation is x equals y plus 3.
00:21
From here we can substitute the expression y plus 3 into our other equation for our x variable.
00:29
5 times y plus 3 plus 4y is equal to 6.
00:37
Now we have one equation in one variable.
00:40
Using the distributive property, let's simplify the equation.
00:45
5y plus 15 plus 4y is equal to 6.
00:51
Combine like terms, 9y plus 15 is equal to 6.
00:57
Subtract 15 to both sides, and we have 9y equals negative 9.
01:03
And finally, to get y by itself, divide both sides by 9...