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Section 7. Exercises 52, 72, 78 Solve each system by substitution. Determine whether the equations are independent, dependent, or inconsistent. X - Y...

Section 7.2: Exercises 52, 72, 78
Solve each system by substitution. Determine whether the
equations are independent, dependent, or inconsistent.
52). X – Y = 10
0.1x + 0.5y = 13

72). X + 6y = -2
5x – 20y = 5

78). Y – 2x = -7.5
3x – 5y = 3.2


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52.
x − y = 10 and 0.1x + 0.5y = 13 second equation same as x + 5y = 130 so
we have
x − y = 10 (1) x + 5y = 130 (2) from (1) we have x = 10+y Putting this in equation (2) we have 10+y +5y =...

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