B...
I think...
Sorry if it's not right. But it's worth a go!
Answer:
-5
Step-by-step explanation:
3(4)+x=7
12+x=7
x=-5
y = 4x-9
Answer : Slope = 4 because y = mx+b
Y- intercept = 9
Any line can be graphed using two points values, and plug them into the equation to find the corresponding values.
HOPE THIS HELPS!