book Maths Puzzle Numerical Ability

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

5x + 7y = b

and

mx + y = 22

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book Other Question

x+4=t over 7 I need assistance with this story problem-
I am building a square pond, I want to put a 2-foot wide brick border around the outside. If the total area of the border and the pond is 196 square feet, find the dimensions of the ond.