exam Maths Puzzle Numerical Ability

Solve each system by substitution.

-2x=6y+18
-29=5y-3x

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exam Other Question

Find an equation of the line having the given slope and contaning the given point.

m=0,(0,-6)
I came up with this y-6=0x-0
but I know this can not be right! Indicate yes or no if the following are functions?
1. y=x^3
2. y=x^2-1
3. y=5
4. y=x^4