exam Maths Puzzle Numerical Ability

A) -4 -3 -4Z = 1
-5 +1Y +2z =-34
5X -1Y = 28

B) 5X +5Y -1z =21
3X -2Y -4Z =48
4X -4Y -1Z =42

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exam Other Question

Simplify the expression. Write the reslut using positive exponents only.

5^-7x^-3y^2
____________
5^-4x^-6y^4 What is the equation if the line perpendicular to y= 2x + 7 and is passing through (1, -8)