How do I solve simultaneous equations?
A easy way to solve simultaneous equations is to substitiute one equation into another and then equate to find one of the unknowns. Once this has been found its a simple matter of substituting it back into the original equation to find the other unknown,
Example: Solve 2a+3b=13 & a+5b=17
Rearrange "a+5b=17" so a=17-5b. Then reintroduce this into equation 1.
2(17-5b)+3b=13 Solving gives b=3
Substituting b=3 into a+5(3)=17 and solving gives a=2
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Related Maths GCSE answers
All answers ▸Find x and y of these two equations: 2x - 3y = 13 and 3x + y = 3
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