exam Maths Puzzle Numerical Ability

Is the following trinomial a perfect square?
x^2 + 18x + 81

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exam Other Question

Find values for m and b in the following system so that the solution to the system
is (-3,4).

5x+7y=b
mx+y=22

Please help!!
Thanks so much!!! Write an equation of the line that passes through the point and has the given slope. Write the equation in slope-intercept form.

(7, -7), m = -3