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Solve the simultaneous equation: 2x +y =18; x-y=6. (3)

Turn x-y=6 into y=6+x.2) Insert y=6+x into 2x+y=18; get 2x+6+x=183) Turn the latter equation into 3x=18- 6=124) Divide 12 by 3 to get x=45) Insert x=4 into y=6+x into y=106) Conclude with x=4 and y=10
JB
Answered by Joshua B. • Maths tutor
3367 Views

(i) Find the gradient of the straight line passing through the points: (0,3) and (9,21). (ii) Write down the equation of the line in form y = mx + c

(i) To find the gradient of a straight light, we take any two (different) points on the straight line and compute the change in Y divided by the change in X. So here this is; (21-3)/(9-0) = 18/9 = 2. So the ...
CG
Answered by Charlie G. • Maths tutor
5503 Views

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. -->...
MA
Answered by Mark A. • Maths tutor
4356 Views

How can you factorise x^2-9

First, we notice how there is only an 'x 2 ' 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 'x 2 -(any square number...
RA
Answered by Rebecca A. • Maths tutor
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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 dig...
AJ
Answered by Amala J. • English tutor
3846 Views