exam Maths Puzzle Numerical Ability

how do you solve each system by substitution?

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exam Other Question

Multiply: 7u^6 * 4u^3
Multiple choice answers.
A) 11u^9
B) 11u^18
C) 28u^18
D) 28u^9

I get 28u^18 is this right? (6,y) (3/2,4/5) when m=2/3