Show all your work for questions 3 to 8. 3. Knowledge and Understanding
In each case, a research topic and two sources of information are described. Decide which
data source is more likely to provide reliable data. Justify your choice. (4 marks)
a) Topic: The benefits or adverse effects of eating organically-grown vegetables.
Source 1: A pamphlet distributed by dieticians and health care professionals
Source 2: A pamphlet distributed by manufacturers of pesticides and herbicides
b) Topic: The advantages and disadvantages of driving hybrid cars.
Source 1: An information booklet written and produced by a major oil company
Source 2: An information booklet written and produced by an environmental group

5x + 3y = - 4

step-by-step explanation:

the equation of a line in standard form is

ax + by = c ( a is a positive integer and b, c are integers )

express the line first of all in slope- intercept form

y = mx + c ( m is the slope and c the y-intercept )

to calculate m use the gradient formula

m = ( y₂ - y₁ ) / ( x₂ - x₁ )

with (x₁, y₁ ) = (7, - 3) and (x₂, y₂ ) = (4, - 8)

m = = -

y = - x + c ← is the partial equation

to find c substitute either of the 2 points into the partial equation

using (4, - 8 ), then

- 8 = - + c ⇒ c = -

y = - x - ← in slope-intercept form

multiply all terms by 3 to eliminate the fractions

3y = - 5x - 4 ( add 5x to both sides )

5x + 3y = - 4 ← in standard form

fd

step-by-step explanation:

c

step-by-step explanation: easy math