Solve the following system.
x - y = 10
x + y = 8
Answer

(9, -1)

(9, 1)

(-1, 9)

(-9, 1)

Question

Solve the following system.
x - y = 10
x + y = 8
Answer
		
(9, -1)
		
(9, 1)
		
(-1, 9)
		
(-9, 1)

bahrom7893 · Answer

Okay this is how u solve systems. First solve one equation for one variable.

bahrom7893 · Answer

So solve the first equation for x, or y, doesn't matter. Let's solve for x:
x-y=10
Add y to both sides. What do u get?

anonymous · Answer

x = y + 10

bahrom7893 · Answer

Correct. Now plug that into the second equation:
x + y = 8, but now that u know x, plug that instead of x in here. What do u get?

anonymous · Answer

2y+10=8

bahrom7893 · Answer

correct. Subtract ten from both sides. What do u get?

anonymous · Answer

y = -1

bahrom7893 · Answer

awesome. Now plug that back into the equation you had before.

anonymous · Answer

x + -1 = 8
x = 9
danks schun!

bahrom7893 · Answer

Yup. Your points are given in the form (x; y). Find whichever's yours.

bahrom7893 · Answer

good job lol.

anonymous · Answer

lol