The fact that it takes Earth 365 days to move year in and year out has been known for many centuries. Even before heliocentric and geocentric models were introduced, people were already familiar with the 365 day period. Perhaps Galileo would be the answer, but hasn't been truly defined as to who first observed this.
Answer:
x=9
y=12
Step-by-step explanation:
. Substitute the given value of x into the equation so... -5(2y-15)+4y=3
. y=12
. Substitute the given value of y into the equation x=2y-15 so... x=2 x 12-5
. x=9
.The possible solution of the system is the ordered pair (x,y) so... (x,y)=(9,12)
Answer:
Step-by-step explanation:
The easy way to make 2 perpendicular lines is let one be x = 3 and let y = 2.
The third line can be anything that has a minus sign in front of the x. See the graph below. The third line cannot be perpendicular to the other 2.
Sorry, the bottom of the graph got cut off. If you print out the graph and extend the vertical line and the slanted line, you will see how this works.
The three lines are
There is no answer, no factors of 27 add up to -18. are you sure the did the math right before this?