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Question
S1.
We now take a
look at Simultaneous Equations. which not only uses
an 'x'. but will also feature a 'y'. But don't
panic - yet.
Here's the sort
of Question where a Simultaneous Equation can be
extremly useful.
A
man buys 2 Burgers and 3 portions of French Fries
for $12
Another man buys 1 Burger and 4 portions of French
Fries for $11
How
much are the burgers and how much are the french
fries?
You know you
need to use Simultaneous Equations because you are
given two sets of facts with 2 unknowns:
We write the 2
facts in algebraic form.
(1)
2B + 3F = 12
(2)
..B
+ 4F = 11
We double the
(2) equation in order to get 2B in both equations.
(In other examples the multiplier will be
different)
(3)
..2B
+ 8F = 22
We now subreact
(1) from (3)
(3)
..2B
+ 8F = 22
(1) ..2B
+ 3F = 12
(4)..............
5F = 10
F =
$--
If
you don't know how to proceed click
here
for help.
Click on the
answer below you believe is the correct
one
Answer
to question S1:
'A'
-
Burgers
cost $4, French Fries cost $1
'B'
- Burgers
cost $5, French Fries cost $2
'C'
- Burgers
cost $4, French Fries cost $1.50
'D'
-
Burgers
cost $3, French Fries cost $2
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