Answer:
it is a relationship where the first difference is equal and the second difference is 0
5x−y=12 Subtract 5x from both sides of the equation.
− y = 12 − 5 x Divide each term in
− y = 12 − 5 x by - 1 and simplify
y = - 12 + 5 x
i don't know if thats what your answer was but there you go
3x + 4 = 7x - 9
4x = 13
x = 13/4
answer x = 13/4 (second choice)
It is a sinusoidal graph, which oscilates around the x-axis (y=0), from y = -0.5 to y = 0.5
General description (as reference)
It passes through the origin (0,0), increases until the max value (y = 0.5) when x = π6, then start to decrease, crosses the x-axis x = π/3, continues decreasing until the min value (y = -0.5) when x = 2π/3, then it starts to increase, crossing the x-axis again at x = 2π/3, and the pattern repeats indefinetely to the right of x = 2π/3 and to the left of x = 0.
Specific description:
Amplitud: 0.5----> the coefficient in front of the sine function
Period: 2π/3 ----> 2π divided by the coefficient in front of the argument (3)
Points of intersection with the x-axis: 0 + /- nπ/3, with n = 0,1,2,3,.....
Type of function: odd
Maximun value: 1/2
Minimum value: -1/2
0.6 = 0.60
0.58 is 2 smaller than 0.6, so 0.6 is bigger
20% = 1/4 = 20, £80 + £20 = £100
20% = 1/4 = £600 - £20 = £580