exam Maths Puzzle Numerical Ability

solve system by substitution

4x-12y= 5
-x+ 3y=-1

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exam Other Question

In the figure below, points C, D, and F are collinear, ACF and CDE are equilateral traingles, and b +d= 90 degrees. Use a two column proof to prove that ABC is a right triangle. line passes through (0,-6) and is perpendicular to the x-axis. What is the solution?