Aim #23: How do we solve a system of equations algebraically using the
substitution method?
Homework : Handout
Do Now: Consider the two system of equations below. Verify whether the
given ordered pairs are solutions:
(3,4) (2, 2.4)
y = x + 1 4x + 5y = 20
y = -2x + 10 2x + 6y = 10
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Besides solving a system of equations GRAPHICALLY , another method is the
SUBSTITUTION METHOD . By replacing one variable with an equivalent
expression containing the other variable, you can create a one-variable equation
to solve.
Example 1: y = 2x + 1
x - y = 7 Check your solution!
Example 2: 2x + y = 4
2x + 3y = 9
Check your solution!
10-24-16
