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Solve algebraically: 6x + y = 16, 5x - 2y = 19

The first step to eliminate one of the unknowns, in this case x or y . This can be done by making the coefficient (the number before) of one of the unkowns the same number, or the negative of the same number...
CR
Answered by Caitlin R. • Maths tutor
5974 Views

Solve the following simultaneous equation: 3x+2y=20 and x+4y=20

We are going to try to eliminate one of the variables in one of the equations. This can be done by rearranging the second equation to x=20-4y. And then substituting x into the first equation.3x+2y=20 => 3...
SK
Answered by Stephanie K. • Maths tutor
5787 Views

67,854 people went to a football match. What is this number rounded to the nearest thousand?

We need to convert the number 67,854 (XX,XXX) to the form XX,000. We need to round it to the nearest thousand. The digit for the thousand is 7, so we move on to the digit on its right, which is 8.Now, if the...
SK
Answered by Stephanie K. • Maths tutor
5526 Views

Factorize x³-x

x³-x=x(x²-1)=x(x+1)(x-1)
JQ
Answered by Jia Qin L. • Maths tutor
19526 Views

What is the gradient of y = xcos(x) at x=0?

First we want to calculate the derivative of y. To do this we use the product rule:If we rewrite y as y = uv, then dy/dx = v du/dx + u dv/dx.Here, we have u = x and v = cos(x).That means du/dx = 1 and dv/dx ...
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Answered by Fraser F. • Maths tutor
4958 Views