Equations of straight lines are in the form y = mx + c (m and c are numbers). m is the gradient of the line and c is the y-intercept (where the graph crosses the y-axis).
Infinitely many, because if you simplified the right side, it would equal the left side.
His investment will be worth $1,619.69 in 10 years.
1,234
One thousand
Two hundred
Thirty four
