Question

x + 3y = 7
x - 3y = 1

Solve?

Answer 1

do you know how to add them ?

Answer 2

im in 9th and we havent done this yet but its on my homework

Answer 3

x + 3y = 7
x - 3y = 1
-------------add
2x = 8 -- divide both sides by 2
x = 4

now that we know x, we can sub 8 in for x in either of the original equations
x - 3y = 1
4 - 3y = 1
-3y = 1 - 4
-3y = -3
y = 1

so x = 4 and y = 1......or (4,1)

Answer 4

we added....you see how the 3y's cancelled each other out...then I solved for x
once x was found, sub that back in and solve for y

Answer 5

thanks alot! now i can try to do the others on here.

Answer 6

good to hear :)