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Solve the simultaneous equations: (3x+2y=3), (x-y=-4)

3x+2y=3 x-y=-4 First, we want to cancel out either x or y so that all we have left is the one we haven't cancelled and a number. To do this we can add or subtract the two equations, possibly multiplying one ...
RB
Answered by Rohan B. • Maths tutor
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Differentiate 2cos(x)sin(x) with respect to x

To solve this differential, firstly note that 2cos(x)sin(x) = sin(2x) (by the Double-Angle Sine Identity), this makes computing the differential a lot easier. To differentiate sin(2x) we need to use the chai...
RH
Answered by Ryan H. • Maths tutor
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Which of the following lines is not perpendicular to y=2x+1? (A) y+1/2x=6 (B) 2y=4-x (C) 2x+y=4 (D) y=-1/2(7+x)

First of all, we need to figure out how to tell whether 2 lines are perpendicular. For any equation written in the form 'y=mx+c', the important bit of information we need to answer this question is the value...
OD
Answered by Oliver D. • Maths tutor
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If two linear equations, y = x + 4 and y = 2x + c, intersect at x = 1, find c.

Draw the two equations, indicating the point of intersections (whiteboard).If the lines intersect at x=1, then at that point the y values of each equation are equivalent. Therefore, x+ 4 = 2x + c.Inputting x...
TD
Answered by Tutor27510 D. • Maths tutor
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How do I know when to choose which statistical test?

MOID - Mann Whitney U test; ordinal data, independent groups, test of DifferenceSCOR - Spearmans test; test of Correlation, ordinal data, repeated measures or matched pairs designCIND - Chi squared test; ind...
Answered by • Psychology tutor
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