3x - 4y = -24 x + y = -1 We need to solve x + y = -1 for x x = -1 - y( I transferred the y in the right side) Substitute -y -1 for x in 3x -4y = -24 3x - 4y = -24 3(-y-1) -4y = -24 You just need to simplify -7y -3 = -24 -7y = -24 + 3 -7y = -21 y= -21/-7 y= 3 Now substitute 3 for y in x= -y -1 x= -y-1 x = -3 -1 x= -4
Answer : x = -4 and y=3 The correct option is D
I hope that's help and if you have questions about my answer please ask. Thx
