Grade 7 Math Practice: Proportionality

x	y
6	15
7	17.5
8	20
9	22.5

Based on the table above, which statement describes the relationship between x and y?

The relationship is proportional because the ratio of x to y is constant.

The relationship is not proportional because the ratio of x to y is constant.

The relationship is proportional because the difference between x to y is constant.

The relationship is not proportional because the difference between x to y is constant.

x	y
2	8
3	11
4	14
5	17

Based on the table above, which statement describes the relationship between x and y?

The relationship is proportional because the ratio of x to y is constant.

The relationship is not proportional because the ratio of x to y is not constant.

The relationship is proportional because the difference between x to y is constant.

The relationship is not proportional because the difference between x to y is constant.

A recipe requires 1.5 cups of flour and 1.8 teaspoons of salt.

If Michael uses 3 cups of flour, how many teaspoons of salt should be used?

4.25

3.6

Sarah is making a scale model of a building. The actual height of the building is 3,500 feet. Sarah wants to make a model using the scale 5 inches of the model for every 45 feet of the actual building.

Which equation can Sarah use to determing x, the height in inches, the scale model should be?

$\dfrac{x}{3,500} = \dfrac{5}{45}$

$3,500x = 5 \times 45$

$x = \dfrac{5}{45} \times 3,500$

$\dfrac{x}{3,500} = \dfrac{45}{5}$