4. Suppose that you after 3 months you have $350 in yor account and after 7 months you have $650.
a) If we let x denote the number of months the and let y denote the amount of money in the account, then
To find a linear equation, first find the slope.
Next, use the point-slope form of the equation
y - y1 = m(x - x1 )
Plug in our numbers.
To solve for y, remove parentheses,
and add 350 to both sides
This would tell you how much money you would have in your account if you opened the account with $125 and put in $75 each month (and there was no interest accumulating).
b) The graph would look like
c) To compute the amount after 12 months, we plug in a 12 for the x in the equation.
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