1. x+5y=8
2x- 5y=1 What you do is find the number/variable that are the same( here is is the +5y and -5y. You want them to be opposites(-,+) so that they cancel each other out. if they are not opposites, then multiply one equation by a negative sign to change it. Cross out the 5y's. Now you can combine like terms-x+2x=3x, and 8+1=9, so now your equation will look like this:
3x=9
x=9/3
x=3
now take x=3 and plug it into the first equation to solve for y. x+5y=8, so 3+5y=8
5y=8-3
5y=5
y=5/5
y=1
(3,1) are your answers.
now do the same with the other problems.
The answer is 900, if I read your equation correctly. if its 3 x (2x5) x 3 x 10, then 900 is the answer.
Hello!
You use the Pythagorean Theorem to solve this

c is the hypotenuse
a and b are bases
Put in the values you know

Square the numbers

Add

Take the square root of both sides
3 = c
The answer is 3 miles
Hope this helps!