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Solve the simultaneous equations; 2x + y = 18; x + 3y = 19.

Start by selecting a variable to eliminate from the equations. --> Select x in this case.Take the second equation and multiply by 2. --> 2x + 6y = 38Subtract the first equation from this answer. --&...

Answered by Mark A. • Maths tutor

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How can you factorise x^2-9

First, we notice how there is only an 'x²' term and a number in this expression. Also notice that the number, 9, is a square number. Whenever you have an expression that looks like 'x²

Answered by Rebecca A. • Maths tutor

33429 Views

State the 2 important functions of the pancreas and its role in digestion?

The pancreas has two main functions: an exocrine function that helps in digestion and an endocrine function that regulates blood sugar. The pancreas contains endocrine glads which produces enzymes to aid ...

Answered by Amala J. • English tutor

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When is the passé composé used and when do I use avoir or être?

The passé composé is used to describe completed or repeated actions that were done in the past. It is translated into English as either the past simple tense (e.g. I ate) or the present perfect tense (e.g...

Answered by Serena V. • French tutor

2925 Views

Solve the simultaneous equations 6x - 27 = 15 and 4x + 3y = -3.

Initially we have two unknown variables, so we want to eliminate one of the variables (x) to solve for the other (y). The LCM of 6 and 4 is 12, so multiply each equation such that the coefficient of x is ...

Answered by Alannah C. • Maths tutor

3871 Views