exam Maths Puzzle Numerical Ability

dad and four are sitting in a church pew.Barbra wants to sit away from Sonny because he squirms so much during the service.Sonny dosen't want to sit by his sister Tara.the youngest

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I need help using the echelon method to solve each of two equations in two unknowns.

2x + 7y = -8
-2x + 3y = -12
the width of a rectangle is W and the length is 3 more than the width
a.write an expression for the length in terms of W.
b.find the perimeter and the area if the width is 8.