Your friend asks for help on the following question:
Solve the system of equations using substitution:
{x + 7y = 0
{2x − 8y = 22
Your friend says they want to rearrange the first equation for x and get x = -7y, but now they are stuck. What needs to be done next? ______________.
After doing this, you will now have _____.
You tell your friend to remember that substitution means to replace. So we are replacing ____ with ____.
Final answer is __________.
