exam Maths Puzzle Numerical Ability

Solve by addition. If a unique solution does not exist, state whether the system is inconsistent or dependent.
1. 5x + 4y = 7
5x – 2y = 19


2. 3x – 4y = 2
4x – y = 20

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exam Other Question

Sam invested $7,500 for one year, part at 12% annual interest and the rest at 10% annual interest. His total interest for the year was $890. How much money did he invest at 12%. in a triangle the measure of the second angle is 4 times the measure of the first angle. the measure of the third angle is equal to the sum of the measures of the first two angles. find the number of degrees in each angle of the triangle