Y is directly proportional to x when y=30 and x=6
1) work out equation linking x and y
2) work out value of y when x=12

X+ y = k 2x + 3y = k + 1 the point of intersection of the lines has an x-coordinate of a.2k + 1 b.-2k + 1 c.2k - 1

The length of a rectangle plus its width is 25 cm. the area is 156 square cm. what are the length and width of the rectangle? separate the answers with a comma.

Abacteria population is tripling every hour. by what factor does the population change in 1/2 hour? select all that apply