SOLUTION: Jessica is 21 years older than Gabriela. Nine years ago, Jessica was 4 times as old as Gabriela. How old is jessica now?

Question 925387: Jessica is 21 years older than Gabriela. Nine years ago, Jessica was 4 times as old as Gabriela.
How old is jessica now?
Answer by TimothyLamb(4379) (Show Source): You can put this solution on YOUR website!
x = jess age now
y = gaby age now
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x = y + 21
x - 9 = 4(y - 9)
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x = y + 21
x - 9 = 4y - 36
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put the system of linear equations into standard form
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x - y = 21
x - 4y = -27
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copy and paste the above standard form linear equations in to this solver:
https://sooeet.com/math/system-of-linear-equations-solver.php
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solution:
x = jess age now = 37
y = gaby age now = 16
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Solve and graph linear equations:
https://sooeet.com/math/linear-equation-solver.php
---
Solve quadratic equations, quadratic formula:
https://sooeet.com/math/quadratic-formula-solver.php
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Solve systems of linear equations up to 6-equations 6-variables:
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