Using substitution- show you steps X-2y=-25
3x-y=0

y=x+4
2x+y=19

-3a+b=4
-9a+5b=-1

m+2n=1
5m+3n=-23

5c+3d=11
5c-d=5

You need to solve a system of equations. you decide to use the elimination method. which of these is not allowed? 3x - 2y = 7 3x + 4y = 17 equation 1 equation 2

Alistair has 5 half-pounds chocalate bars. it takes 1 1/2 pounds of chocalate,broken into chunks, to make a batch of cookies. how many batches can alistair mke with chocalate he has on his hand?

A5 foot long board is propped against the wall of a house. the board forms a 60° angle with the ground. how far is the base of the board from the wall?