1. 10.2 Solving Systems Using Substitution
One method to solve a system is ________ ,
another is by __________ .
is a method by which you _______
___________ with an __________ which
usually contains the ______________ . Therefore,
you end up with an equation that only has ___
________ . Once you know the _____ of that
_______ , you can ________ that value to find
the _____ of the ____________ .

2. { 1. Solve by substitution. y = 5x + 9 y = -3x + 37
You could have used
the other equation
to solve for y.

3. 2. Mrs. Janeski wants to have a clown deliver
helium balloons to her daughter’s birthday party.
Two companies offer this service. Company A
charges 80 c a balloon, plus a $6 delivery fee.
Company B charges 95 c per balloon but has no
delivery fee. For how many balloons is the cost
the same? (Let x = the # of balloons. Let y = the
cost of balloons.)

4. Both companies will cost the same if you are ordering balloons.
Choose to substitute
for one variable.
2nd
Solve the equation
for that variable.
Both companies will cost the same if
you are ordering balloons.