exam Maths Puzzle Numerical Ability

please help me thank you in advance I really do not understand this problem.

solve the system by graphing

4x + 2y = 10
y=4

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exam Other Question
18 / 2(3) + 4(5) / -22 + 12 Two angles are complementary. One angle is twice as large as the other angle. Find the measures of the angles.