Solve the system.
A. x = -5, y = 1, z = -1, w = 0
B. x = 0, y = -5, z = 1, w = 5
C. x = -10, y = 0, z = -2, w = 1
D. x = 5, y = 3, z = -1, w = -1
Answer: A
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Subtract. Use borrowing, if necessary.
A. 820 B. 826 C. 726 D. 1020
For the given pair of points, find the equation of the line 
that goes through the points by solving a system of equations.(-9, -7) and (-7, -3)
A. y = 4x + 11 B. y = 2x + 11 C. y = 2x - 25 D. y = 2x - 7
Solve the problem.A gas station sells 4820 gallons of regular unleaded gasoline on a day when they charge $1.35 per gallon, whereas they sell 3893 gallons on a day that they charge $1.40 per gallon. Find a linear equation for gallons sold (y) at a price x.
A. y = -18,540x + 29,832.8 B. y = -18,540x + 29,865 C. y = -18,540x + 29,827.2 D. y = -18,540x + 29,849
Find the sum of 
.
?
A. -38 B. 39 C. -39 D. -7 E. None of these