Unit 6: Straight Line Graphs

Question 1

What is the equation of a straight line graph?

Answer 1

Y = mx + c

Question 2

What is ‘m’ ?

Answer 2

m is the gradient

Question 3

What is ‘c’ ?

Answer 3

c is the y-intercept

Question 4

What is the gradient of a straight line?

Answer 4

the slope of the line

Question 5

What can the gradient be ?

Answer 5

positive or negative

Question 6

When the gradient is a positive number, what does the graph look like?

Answer 6

looks like ‘ / ‘

Question 7

If the gradient is steeeper, what happens the line?

Answer 7

The line is steeper

Question 8

What is the ‘ y-intercept ‘ ?

Answer 8

where the line crosses the y-axis

Question 9

What is the formula for finding the gradient of a straight line?

Answer 9

Formula:
change in y
gradient = —————-
change in x

                 vertical gradient =  -------------
                 horizontal

gradient = rise
——-
run

Question 10

Think of lines parallel to the axes:
An equation of the form ‘y=a number’ is WHAT?

Answer 10

a horizontal line parallel to the x-axis

Question 11

Think of lines parallel to the axes:
An equation of the form ‘x = a number’ is WHAT?

Answer 11

a vertical line parallel to the y-axis

Question 12

What is the point of intersection?

Answer 12

the point where 2 lines cross