She can Hang up 4 posters. Because Taylor only has 16 tacks.
16/4=4
B. the slope is positive because its in a straight line
7.6, 8.2, 8.8, 9.4, 10.0, 10.6, 11.2, 11.8, 12.4
Here's the first part:
y = 8x - 9 --(i)
y = 4x - 1 -- (ii)
then in eqn( i),
4x - 1 = 8x -9 (from eqn( ii) )
-1 +9 = 8x -4x
8 = 4x
x =2
then in eqn (i),
y = 8*2 -9
= 16 -9
= 7
The 2nd part:
When these two equations are graphed, at point (2,7) the lines representing the two equations intersect because these values (2,7) satisfies the given equations.
