exam Maths Puzzle Numerical Ability

sin^2x+sinx-1=0

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exam Other Question

for exercise 16 and 17 find the length x and y (every angle on each block is a right angle)
number 16 and 17. I really need help on how to do these

Thanks for you help in adv Instructions: solve each system by the eliminsation method.

What is the solution for x-y=4
x-y=-3