Question

PLEASE HELP ME!!

Solve the following system of equations.

9x + 4y = -45
3x + y = -6

Answer 1

do you prefer substitution or elimination ?

Answer 2

@texaschic101 elimination

Answer 3

9x + 4y = -45
3x + y = -6 --->(-4)
------------------
9x + 4y = -45
-12x - 4y = 24 (result of multiplying by -4)
-----------------add
-3x = -21 -- divide by 3
x = 7
now sub 7 in for x in either equation to find y
3x + y = -6
3(7) + y = -6
21 + y = -6
y = -6 + - 21
y = -27
check..
9x + 4y = -45
9(7) + 4(-27) = -45
63 - 108 = -45
-45 = -45 (correct)

x = 7 and y = -27

Answer 4

@texaschic101 thank you so much, and thanks for walking through the problem, i understand it now! thank u

Answer 5

your welcome :)