exam Maths Puzzle Numerical Ability

2x-4y=8 please help solve this, I need to graph each linear equation by finding the x & y intercepts

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exam Other Question

Factor completely: 2x^2 + 4x - 6

I got:
cannot be facored?

Thanks~ Solve the following equation for the unknown:

1) 6.2(x - 15.1) = 9.3(-x - 3.2)