Answer:
7
Step-by-step explanation:
4x+5y=7
y=3x+9
1) 4x+5(3x+9)=7 2) y=3(-2)+9
y= -6 +9
4x+15x+45=7 y=3
19x+45=7
19x= -38
x= -2
x is -2 and y is 3
2x + 7 = 3
2x = 3 - 7
2x = -5
x = -5/2
Answer:
D
Step-by-step explanation:
Because you are adding to it so it would be a positive