Question

1.)solve for n:-7n-21=-63

my answer: n=3

is this correct? please explain

2.)identify the x and y int for te equation 3x-4y=12.

Answer 1

You'd know that n does not equal 3 by substituting it.

- 7 * 3 - 21 = -63
-21 - 21 = -42 (not -63)

-7n-21=-63
Add 21 to both sides.

-7n - 21 + 21 = -63 + 21

-7n = -42

n = -42 / -7

n = 6


n