Solve the system mentally, without the use of a calculator or pencil-and-paper calculation. Try to visualize the graphs of both lines.x + 0y = 90x + y = 4
A. x = 9; y = 4
B. x = 4; y = 9
C. x = 9; y = 2
D. x = 2; y = 
Answer: A
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Solve. Clear fractions first.
x - 
x = 4
A. -60 B. -120 C. 60 D. 120
Fill in the digits for the given place values in the following whole number.92,225ten thousands ones
A. Ten thousands 9, ones 5 B. Ten thousands 2, ones 2 C. Ten thousands 9, ones 2 D. Ten thousands 2, ones 5
Find the least common denominator.
, 
A. m(m - 1)2 B. (m - 1)2 C. m(m - 6)(m - 5) D. m(m - 1)(m - 5)
Solve.When making a telephone call using a calling card, a call lasting 6 minutes cost $1.10. A call lasting 15 minutes cost $2.00. Let y be the cost of making a call lasting x minutes using a calling card. Write a linear equation that relates the cost of a making a call, y, to the time x.
A. y = 0.1x - 13
B. y = 0.1x + 0.5
C. y = 10x - 
D. y = -0.1x + 1.7