John wants to invest in a simple intereset savings account The intereset rate on this account is 0.7%. The account balance y can be modeled by the following linear equation: y=150,000+150,000(0.007)x where x represents the time (in years) that John leaves her money in the account. What is Johns Initial investment?

John's Initial investment is $150,000  

Step-by-step explanation:

Hi, to answer this question we have to apply the simple interest formula:  

I = p x r x t  

Where:  

I = interest  

P = Principal Amount (or initial investment)

r = Interest Rate (decimal form)  

To obtain the total balance we have to add the principal amount and the interest.

p+ p x r x t  

Analyzing the values given:

y=150,000+150,000(0.007)x

p = 150,000  

John's Initial investment is $150,000  

check above link.

graphically?   well, you graph them both, the solutions is where they both intersect each other, since there are two solutions, meaning they will meet twice, or namely the linear will run into the quadratic curve twice, and where they meet, those x,y coordinates are the solutions to the system.