Math 8B U4: Graphing Linear Equations Unit Test 3 of 15
Determine which set of ratios forms a proportion.
1:16, 3:18
1:16, 3:18 - no response given
5:10, 20:40
5:10, 20:40 - correct
9:10, 45:40
9:10, 45:40 - no response given
1:8, 2:18
show your work
1:8, 2:18
To determine if these ratios form a proportion, we need to check if the cross products are equal.
Cross product of 1:8 = 1 x 18 = 18
Cross product of 2:18 = 2 x 8 = 16
Since the cross products are not equal (18 does not equal 16), the ratios 1:8 and 2:18 do not form a proportion.