A-b=21
5a-2b=18
We can use substitution here. Take the first equation and solve for A. (Picking this one because it's easy)
a = 21+b
Plugin to the second equation:5(21+b)-2b=18
Simplify: 105 + 5b - 2b = 18
Simplify: 105 + 3b = 18
Subtract both sides: 3b = 18-105
Simplify: 3b = -87
Divide: b = -29
Plug back into the first: a=21+b
a = 21 - 29
a = -8
Option D
Answer:
Photomath help you get the answer
Step-by-step explanation:
down 3 unit mean -3 outside root
right 2 unit mean -2 inside root,
so the answer is
5,000 × 3.8%= 19,000×18= 342,000 × 40 = 13,680,000
