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Home > A2C > Chapter 9 > Lesson 9.3.2 > Problem 9-151

9-151.

Multiply the second equation by −1 and add the two equations together.

2x + y = 10
xy = −25

x = −15

Use the x-value to calculate the y.

y − 15 = 25

y = 40

(−15, 40)

Solve the first equation for y and substitute it into the second.