Question 825354: Alexander wanted to purchase a bicycle that costs $240. He made this table to show how much money he had in the first 4 months of saving money.
Month Amount of Money
1------ $140
2------ $155
3------ $170
4------ $185
I SEE IT INCREASES BY $15 AND THOUGHT IT WOULD BE y= 4x + 15 but when you to do the math it doesn't work. Please help
Answer by TimothyLamb(4379)   (Show Source):
You can put this solution on YOUR website! ---
given the x,y data table:
1 140
2 155
3 170
4 185
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to solve the linear equation, copy and paste the above x,y data table:
into the input box of the linear regression solver here:
https://sooeet.com/math/linear-regression.php
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the data is perfectly linear according to the linear regression:
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result:
y-intercept = (0, 125)
slope = 15
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answer:
the slope-intercept form of the regression line:
y = 15x + 125
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interpretation:
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he saves $15 by the end of each month, but he starts out with $125 already in the savings account
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Solve and graph linear equations:
https://sooeet.com/math/linear-equation-solver.php
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Solve quadratic equations, quadratic formula:
https://sooeet.com/math/quadratic-formula-solver.php
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Solve systems of linear equations up to 4-equations 4-variables:
https://sooeet.com/math/system-of-linear-equations-solver.php
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