Which equation results from adding the equations in this system? x + 6 y = 9.
Negative x + 2 y = negative 15.

8 y = negative 6
8 y = 6
4 y = 24
4 y = negative 6

At the beginning of 1974/75,2 years a man invested #2000 in a bank at 12.5% compound interest, if it degree #650 at the end of each two years to pay his son's school fees, after payment of interest to pay his son's school fees, how much did he have left at the beginning of the 1978/79 school year?

The areas of two similar triangles are 72dm2 and 50dm2. the sum of their perimeters is 226dm. what is the perimeter of each of these triangles?

Acompany made a profit of 75000 over a period of 6 years on an initial investment of 15000 what is the annual roi