exam Maths Puzzle Numerical Ability

cos^2xcos^2y+sin^2xsin^2y+sin^2xcos^2y+sin^2ycos^2x=1

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exam Other Question

Sovle the pairs of equations using the substitituion method.

x - y = 26

3x - 8y = 3

So far I have: 3(26 + y) - 8y = 3 69y - 8y = 3 hi!
could you help me with this word problem.

thanks.

the sum of two numbers is 15. three times one of the numbers is 11 less than five times the other. find the number.