exam Maths Puzzle Numerical Ability

x+9y=9
3x+6y=6

chapter 7 summary & reviw.

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i need to solve this equation by using the discriminant to determine the number of solutions and if real or complex. i came up with two solutions that were real. equation: 2x2 + x What was the percent increase in the population from 1900 to 2000?

1900 - Population 38,000,000
2000 - Population 515,000,000