exam Maths Puzzle Numerical Ability

Write the equation of the line which has y-intercept (0, 5) and is perpendicular to the line with equation y = -3x + 1.

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exam Other Question

Ricardo is 4 years less than twice as old as his sister. The sum of their ages is 20. How old is Ricardo?

Thanks I need help figuring out how to solve this question.

Solve for x. 3x - 2y = 6