exam Maths Puzzle Numerical Ability

1)y=-2/3x
2)y=-2x+5
3)log34/h
4)log3c5d

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exam Other Question

DECIDE WHICH OF THE TWO POINTS IS A SOLUTION OF THE EQUATION.

X+Y=8
A.(2,4)
B.(2,6)
How many 3-digit codes using the digits 0 through 9 are possible if repetitions are allowed. Is it 504, 729, 30, 1000. Can you show me how to work this out?

Thank you,

Ellen