katie__michelle By using substitution: 15x+3y=5 5x+y=-6 Show me how to do this. one year ago one year ago

1. zepdrix

Let's manipulate the second equation, we'll get it in terms of y=, and then we'll PLUG it into the first equation. \[\large 5x+y=-6\]Subtracting 5x from both sides gives us,\[\large y=\color{cadetblue}{-6-5x}\]We want to plug this in for the y in the other equation.\[\large 15x+3\color{cadetblue}{y}=5\] Which gives us,\[\huge 15x+3\color{cadetblue}{(-6-5x)}=5\]

2. zepdrix

We SUBSTITUTED one equation into the other one. From here it's not too bad. We just have to multiply the 3 by each term in the brackets, and then solve for x. If you're still confused, let me know.

3. katie__michelle

Okayy I will,

4. nickersia
5. katie__michelle

@nickersia Oh thanks.