by the use of elimination method
make all coefficients of subject to be eliminated similar..by multiplying the coefficients with one another
for eqn(i)
5(-10y+9x=-9)
-50y+45x=-45
for eqn(ii)
9(10y+5x=-5)
90y+45x=-45
-50y+45x=-45
90y+45x=-45
...subtract each set from the other...
we get
-140y+0=0
y=0
from eqn(i)
10y+5x=-5
0+5x=-5
x= -1
18 glasses of water
3.6/.2=18
Answer:
D. x = 22.5
Step-by-step explanation:
Answer:
the missing section is 49%
Step-by-step explanation:
11 + 18 + 15 + 7= 51
51 + 49 = 100
add the percentages together and you get 100%