v A t-shirt originally costs $18.50. It is on sale for 10% off. What is the sale price of the t-shirt?
1 answer:
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Let
x-------> the first number
y-------> the second number
we know that
equation 1
equation 2
substitute the equation 1 in equation 2
![[-5-y]*y=-90 \\ -5y- y^{2} =-90 \\ y^{2} +5y-90=0](https://tex.z-dn.net/?f=%5B-5-y%5D%2Ay%3D-90%20%5C%5C%20-5y-%20y%5E%7B2%7D%20%3D-90%20%5C%5C%20y%5E%7B2%7D%20%2B5y-90%3D0)
using a graphical tool to resolve the second order equation
see the attached figure
the numbers are
-12.311
7.311
x-------> the first number
y-------> the second number
we know that
substitute the equation 1 in equation 2
using a graphical tool to resolve the second order equation
see the attached figure
the numbers are
-12.311
7.311