Linear Relationships

Find the y-intercept in this straight line equation:

y = 3x - 7

Find the y-intercept in this straight line equation:

y = 14 + 2x

Find the y-intercept in this straight line equation:

5x = y - 1

A line has the equation  $y\ =\ -\frac{1}{3}x\ +\ 2$  
Find the x-intercept

A line has the equation  
   $y\ =\ -\frac{1}{3}x\ +\ 2$  
Find the y-intercept

A line has a gradient of  $-\frac{1}{2}$  and a y-intercept of 4.
State the equation of the line.

• y = -1/2x + 4

• y = 1/2x + 4

• y = -1/2x + 2

• y = 1/2x + 2

A line passes through the points (-3, 2) and (4, -5).

Find the gradient of the line.

A line passes through the points (-3, 2) and (4, -5).

Find the equation of the line.

• y = -x + 1

• y = -x - 1

• y = x + 1

• y = x - 1

A 16GB iPhone costs $1199. A 16GB phone plan from Optus costs $49 per month.

Find a linear equation for the total cost (C dollars) of the phone with this plan, after t months.

Also find the cost after 1 year.

• $C = 49t + 1199, $1787

• $C = -49t + 1199, $1787

• $C = 49t - 1199, $1878

• $C = -49t - 1199, $1878

The line through (2, 7) and (-1, n) has a gradient of 5.
Find n.