exam Maths Puzzle Numerical Ability

I need help in solving this equation -7x+4x=9

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exam Other Question

Write an equation of the Line 1 passing through (3,-4) that is parallel to the Line II 5x-3y-9=0. Does the line I pass through the point (6,7)? Does the line II pass through the point (6,7)?
graph y=-2(x+1)^2+5