She saved $130 per month and she started with $640.
A linear equation is in the form:
y = mx + b;
where y, x are variables, m is the slope of the line and b is the y intercept.
Let y represent the total money Tyra has after x months.
After 8 months, she had $1680, hence:
1680 = 8m + b (1)
After 1 year (12 months), she had $2200, hence:
2200 = 12m + b (2)
Solving equation 1 and 2 simultaneously gives:
m = 130, b = 640
Therefore she saved $130 per month and she started with $640.
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