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What is solution by substitution?

Simultaneous equations - Solution by substitution

As the variables (x & y) are the same in both equations, we can substitute from one equation into ...

AM
Answered by Antonia M. • Maths tutor
6169 Views

When do I use the conditional perfect tense in a "si" clause?

The conditional perfect tense should be used in a "si" clause when there is no possibility for the event to happen. It must also be used with the pluperfect tense. For example: If I had know...

DA
Answered by Daniel A. • French tutor
3624 Views

Solve the following simultaneous equations: 4x + y = 14 and 6x - y = 16

Prove why the quadratic formula works

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