Year 9
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Lesson details
Key learning points
- In this lesson, we will determine how to eliminate a variable by adding or subtracting one equation to or from the other.
Licence
This content is made available by Oak National Academy Limited and its partners and licensed under Oak’s terms & conditions (Collection 1), except where otherwise stated.
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5 Questions
Q1.
If x=3 and 2x+5y=41, what is the value of y?
3
5
7.8
Q2.
7x+2y=24 AND 4x+2y=18. Find the value of 3x
2
5
7
Q3.
7x+2y=24 AND 4x + 2y = 18. Find the value of y
2
6
7
Q4.
9x +6y=168 AND 9x +4y=160. Solve
Others
x=15 and y = 18
x=9 and y=6
y=16 and x=4
Q5.
4x +8y=116 AND 4x +4y=68. Solve
x=12 and y=5
x=4 and y = 8
x=8 and y = 4
5 Questions
Q1.
3x+2y=5 AND 3x-2y=7. If I add these two equations together, which unknown will be eliminated?
both
neither
x
Q2.
3x+2y=5 AND 3x-2y=7. If I subtract the two equations, which unknown will be eliminated?
both
neither
y
Q3.
3x-5y=17 AND 2x-5y=10. Subtract the first equation from the second equation.
5x=27
x-10y=7
y=7
Q4.
2x-5y=10 AND 3x-5y=17. Add the two equations together.
10y=27
5x=27
Q5.
3x-5y=17 AND 7x-5y=20. How can I eliminate y from these simultaneous equations?
add
you can't eliminate y