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
KL
Related Maths GCSE answers
All answers ▸How do I solve the simultaneous equations 3x+2y=17, 4x-y=30?
Factorise and solve x^2-8x+15=0
The Curve C has the equation 2x^2-11+13. The point Q lies on C such that the gradient of the normal to C at Q is -1/9. Find the x-co-ordinate of Q
Comound interest: A car is bought for the price of £12 000, but its value depreciates every year by 8%. Calculate, how much will the car be worth in 5 years