exam Maths Puzzle Numerical Ability

Write the equation of the line passing through (3, -7) and (-6, -7)

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exam Other Question

Can someone help me on this problem?

Which of the ordered pairs:
(-3,3), (9,0), (-3, -3), (-23, 8)
are solutions for the equation x + 4y = 9?

Thanks,
Sher Given f(x)= 3x+3, find f(a+1).