exam Maths Puzzle Numerical Ability

Find the value of y so that the line passing through the two points has the given slope :
(6,4),(-4,y), m=-4

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exam Other Question

Felix drove 800 miles in x hours on
Monday.
a) Write a rational expression for his average speed.
b) On Tuesday he drove for 6 hours at the same average speed. Write a rational expression for his distance on
Tuesday. Solve the system of equations by the Gaussian elimination method:

2x+y -3z=1

3x-y +4z =6

x +2y -z= 9