exam Maths Puzzle Numerical Ability

Write the equation of the line passing through (4, 4) and (4, 2).

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exam Other Question

In a graph, B is the point(0,8). The sloping line through B and the horizontal line through C meets at Point A.
Fubd tge equation of the line AC.

please help me. -- i need help sloving this system if equation by substitution
2x-2y=4
x+3y=1