Work out the size of angle a. angle a =
°

Give a reason why.

Work out the size of angle b.

angle b =

°

Step-by-step explanation:

using the definition of vertical angles

The sum of the interior angles of a triangle is 180 so

or

table 3 represents a direct variation function. : )

step-by-step explanation:

step 1: solve one of the equations for one of the variables. let's solve the first equation for y:

step 2: substitute that equation into the other equation, and solve for x.

step 3: substitute x = 4 x = 4 x=4 into one of the original equations, and solve for y.