1. Evaluate the variable expression when a = - 2, b = 3, and c = 4. 2( b + c ) -

Question

1. Evaluate the variable expression when a = - 2, b = 3, and c = 4.
2( b + c ) - 3a
Answer -

a. 5

b. 6

c. 17

d. 20

2. Solve the equation: - 8( 1 - 5x) = - 48
Answer

a. all real numbers

b. -12

c. - 3

d. - 1
3. Find the equation of the line with slope = 3 and the y- intercept 4.
Answer

a. y = - 3x - 4

b. y = 3x + 4

c. x = 3

d. y = 4
4. ( -1) - (7 - 2 x ( -1))
Answer

a. - 10

b. - 4

c. -6

d. -11
5. Find the equation of a line passing thru the point (0,3) with an undefined slope.
Answer

a.x = 0

b. y = 3

c. x + y = 3

d. x - y = 3

Explanation / Answer

1. 2*(3+4)-3*(-2) =2*7+6=14+6= 20 2. -8*(1-5x)=-48 (1-5x)=6 -5x=5 x=-1 3. m=3, b=4 y=mx+b y=3x+4 4. -1=7-2x*(-1) -8=-2x*-1 4=-x x=-4 5. Undefined slope means dy/dx=inf...thus x=0. Y=3 is a horizontal line whereas x=0 is a vertical line. The answer is x=0.

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