exam Maths Puzzle Numerical Ability

Given that (3x-a)(x-7)=3x3-32x2+81x-70,determine the value of a.

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exam Other Question

No textbook, came from a worksheet

A. Slope = -2, through (2,3)

B. m = -2/3, throught (-3,2)

C. through (6,3) and (5,4)
Hello, can anyone help me with this?

Solve the following system by graphing.

x + y = 6
x - y = 3