True or False:

1. When direct and inverse variations happen at the same time then it is said

to be a combined variation.

2. Direct variation occurs whenever a situation produces pairs of numbers

whose product is constant.

3. A variation is said to be joint if the ratio of one variable to the product of two or more variables is constant.

4. In the equation a = a varies inversely as b.

5. If x and y vary directly, as x increases the value of y increases as well.

6. In the equation y = kx, when x is doubled the value of y doubles.

7. The equation A = bh shows joint variation. 8. Given the equation r =, if the value of s is tripled the value of r also triples.

9. If y varies inversely as x, and y= 12 when x = 3, then the constant of variation.

is 4.

10. In the equation a = a varies jointly as b and d and inversely as c. kbe​