exam Maths Puzzle Numerical Ability

I really need help with this problem. The problem says to find two consecutive intergers whose product is 90, it must be solved algebraically. Thank You.

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exam Other Question

Solving systems of equations using matrices:

4x + y = 7
-5x - y + z - w = 1
z+w = 7

I have z = 7 and know that w is any real number so far but am stuck solving for x and y. Help please. 4(x-1)+2=3x+8-2x