exam Maths Puzzle Numerical Ability

solve by substitution
1. 4x + 5y= 6
y=2x - 10

2. 4x-3y=0
y=x+1

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exam Other Question

How do I solve an equation by factoring, if the sum in a fraction?

EXAMPLE: 6x + 7 = 20/x An express and local train leave Grays Lake at 3 P.M. and head for Chicago 50 miles away. The express travels twice as fast as the local and arrives 1 hour ahead of the local. Find the speed of each train.