A rectangle has a perimeter of 96
inches and three times the width is
four more than twice the length.
What is the length and width of the
rectangle?
Now rewrite in standard form.
MULTIPLY
Add to eliminate (cancel out) the L's.
Plug 20 in for W into any equation
to solve for L.
Fin
1
a
al
ns
we
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wi
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nit
2
2x + 5y = 3
11x – 20y = 28
3x + 10y = –3
3x = 36 – 4y
DIVIDE
3
You are purchasing satin and felt from the
fabric store. You spend $81 on 20 yards of
fabric. The satin fabric costs $6 per yard
and the felt costs $3 per yard. How much
satin and how much felt did you purchase?
When necessary, you can
multiply or divide BOTH of the
equations by a constant
so that one of the
variables can be eliminated.
4
5
7x + 3y = –12
–10y = –7x – 11
5y = –2x + 38
15y = 34 + 8x
6
4x + 5y = 35
2y = 3x – 9