Use the method of substitution to solve the following pairs of simultaneous equations 1. y=2x-4 and 3x + y = 11
2. a=5-2b and 5a + 2b =1
3. 2m+n=0 and m+2n=3
4. x+y=4 and 2x-y= 5
5. y-2x=1 and 3x-4y=1

Aflagpole broke in a storm. it was originally 8 1 81 feet tall. 2 8 28 feet are still sticking straight out of the ground, where it snapped, but the remaining piece has hinged over and touches the ground some distance away. how far away is the end of the pole from the base of the pole along the ground?