exam Maths Puzzle Numerical Ability

DETERMINE WHICH 2 EQUATIONS REPRESENT PERPENDICULAR LINES.

A)Y=9X-3
B)Y=1/9X+3
C)Y=-1/9X+3
D)Y=1/9X-3

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exam Other Question

Determine whether each ordered pair is a solution of the system

A (1,-5)
B 4x-4=9
C 2x=3y=-13

Please help me with this equation

Thanks How many pounds of hamburger that costs $1.10 per pound must be mixed with 50 pounds of hamburger that costs $1.80 per pound to make a mixture that costs $1.30 per pound?