−5x+4y=3
x=2y−15
what does x and y equal

Determine the difference: 3.2 × 1010 – 1.1 × 1010. write your answer in scientific notation.

Two variables, x and y, vary inversely, and x=12 when y=4. what is the value of y when x=3?

The point of intersection of the diagonals of a rectangle is 4 cm further away from the smaller side then from the larger side of the rectangle. the perimeter of the rectangle is equal to 56 cm. find the lengths of the sides of the rectangle. 16 points answer quick