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How Do We Solve By
Substituting Variables
Section 7.2 in your textbook
Please solve for the variable
9x + y = 7 ; y
3x + 6y = 9 ; x
2x – 2y = 8 ; y
√ Check the equation you would use to
isolate the variable most easily,
in each set:
What if?
Let’s check out “Mrs. Jenkins.”
Solve the linear system using
Remember to check
your solution in
each of the original
Remember, when x or y is not yet isolated, we
need to solve for the easiest variable:
A little more challenging…
…you can handle it!
Checkpoint 4 U!