exam Maths Puzzle Numerical Ability

Solve each of the following systems by substitution.

9. 5x � 2y = -5
y -5x = 3

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exam Other Question

a rope 82cm long is cut into two pieces with one peice 4 more than twice as long as the other. find the length of each piece. Simplify. Assume all variables represent positive numbers.

SQRT x^4y^3

Can anyone help me understand this type of problem. I am so lost with the concept pf trying to figure this problem out. Thank you in advance as well!