Starts at 20 so look for y-intercept of 20
Leaves answers (2), (3) and (4)
Doubles every 10 years so must go up.
Leaves answers (3) and (4)
Which one looks like doubling every 10 years
(0, 20) is the starting point
(10,40) ten years and it doubles
(20,80) ten more years and it doubles again
(30, 160) ten more years and it doubles again
(40, 320) ten more years and it doubles again
Now we are off the graph!!
Look at the graph above to the right, where does it cross the x-axis?
Confirm these values by looking at the table below…for what x values does y = 0?
Find those values in one of the answer choices above. TWO POINTS!!!
By putting the original algebra into Y1 and answer (1) into Y2, we can see that the tables are exactly the same which means equivalence!!
(if they were not the same, we would change Y2 to be the next answer and compare those y values with Y1)
Um, so this graph looks like which graph above??
Match it pick it — 2 more points!!!
Look at the table for the y values from x = 2 to x = 6
The points are:
(2,0)
(3,2)
(4,4)
(5,6)
(6,8)
Notice that the lowest y value is 0 and the highest is 8.
PS the way this question is written you do not have to know that range means the y values and domain means the x values as all of the answer choices have “y”
If you do need to remember this:
x comes before y in the alphabet and
domain comes before range!!
Math Confidence by Robin the Math Lady 