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'x' times '2y' is written as '2xy'.
In Algebra.
Addition is shown as 'a + b' '.
Subtraction is shown as 'a - b'
Multiplication is shoewn as 'ab' (NB no multiplication sign 'x', as it might be confused with the unknown 'x'.
Division is showen as a/b ( like a fraction).
NB '2y' means '2' Times 'y' So overall 2 X y X x = 2xy . Notice ; for clarity ,I have put in 'capital ' 'x' for multiplication. However, hopefully you can see that it may become unclear which is the unknown 'x'.
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Three times the product of twice a number y and x?
3(2y)(x)6xy
Where does the line intersect x equals 5 and x-2y equals 6?
x = 5 x-2y = 6 => x = 6+2y 6+2y = 5 2y = 5-6 2y = -1 y = -1/2 and x = 5 Point of intersection: (5, -1/2)
What is the answer to the equation (x - 2y = -2)?
4
How do you Substitute x equals y plus 3 into x plus 2y equals 9?
x = y+3 x+2y = 9 => x = 9-2y y+3 = 9-2y 2y+y = 9-3 3y = 6 y = 2 and x = 5
X-2y equals o 9y-4x equals 1 substitution method?
x - 2y=0 so x = 2y 9y - 4x=1 Substituting for x, 9y-4*(2y) = 1 or 9y-8y = 1 so that y = 1 then x = 2y = 2*1 = 2
