exam Maths Puzzle Numerical Ability

How do you solve 20x = 30y - 45000
also, 0.4x + 1.2y =4.8

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exam Other Question

3x+6y=9
4x+5y=15
x-y+4=0
5x+15+5y=10x
2x+2y-4=x+5

Examples that my teacher gave me to help me out, but i still don't understand. so can you please hel Write a quadratic equation based on the points (-1,0), (0.67,0), and (0,-2); and find its solution.