Question
solve by the substitution method. 8x+5y=-46
-4x+y=30. What is the solution set, because i have tried to figure this out for 20 minutes, please help
-4x+y=30. What is the solution set, because i have tried to figure this out for 20 minutes, please help
Answers
Reiny
from the second : y = 4x+30
sub that into the first
8x + 5(4x+30) = -46
8x + 20x + 150 = -46
28x = -196
x = -7
then y = 4(-7) + 30
= 2
sub that into the first
8x + 5(4x+30) = -46
8x + 20x + 150 = -46
28x = -196
x = -7
then y = 4(-7) + 30
= 2