I think it’s A I’m sorry if I am wrong so I am pretty sure it’s A
Answer: -1.7
Step-by-step explanation:
Given : Another home business has an average income of $1.200.00 per month with a standard deviation of $100.00.
i.e.

Let x represents the monthly income.
Since . 
For x= 1030 , we have

Hence, the required z-score = -1.7
4x=-3y+17 becomes 4x+3y=17
4x+3y=17
3x-4y=-6
alrighty
elimination
muliply first equation by 4 and 2nd by 3 and add them
16x+12y=68
9x-12y=-18
add them
25x+0y=50
25x=50
idivide both sides by 25
x=2
sub back
3x-4y=-6
3(2)-4y=-6
6-4y=-6
-4y=-12
y=3
(x,y)
(2,3)
X = 12400
20/100 = 1/5
2480 x 5 = 12400