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Method when the coefficients are not the same
and one is negative
Solve the simultaneous equations
3x + 7y = 8
x - 3y = 0
Multiply the second equation by .......
Are you eliminating the xs or the ys?
Will you add or subtract the equations?…read more

Slide 3

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Method when the coefficients are not the same
3x + 7y = 8
x - 3y = 0
3x + 7y = 8
3x - 9y = 0
Subtract equations:
7y - -9y = 16y
16y = 8
y = 0.5 x = 0 + 3 x 0.5 = 1.5…read more

Slide 4

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Deciding when to subtract and when to add
4a - 5b = 14
3a - 5b = 19
The coefficients of the bs are the same.
Subtract the equations:
a = -5
5b = 4a - 14 = -20 - 14 = -34
b = -34 ÷ 5 = -6.8…read more

Slide 5

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Deciding when to subtract and when to add
and
whether to multiply no, one or two equations
(a) 11x - 6y = 42
3x + 2y = 19
(b) a + 3b = 7
7a + 5b = 13
(c) 3r - 5f = 18
4r 2f = 20…read more

Slide 6

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TIPS FOR SOLVING EQUATIONS
·Write down every step.
·Be methodical.
·Remember to do the same operation to both
sides of an equation.
·Decide which variables you are going to
make the same. Sometimes it doesn't matter,
but sometimes it does!
·Remember to solve simultaneous equations,
you need to find solutions for both variables.
·Check your answers by substituting back
into the equations.…read more

Slide 7

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Slide 8

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Comments

daviesg


A good demonstration/discussion presentation

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