exam Maths Puzzle Numerical Ability

Solve by substitution.
38.) 10x + 2y = 7
y = -5x +3

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exam Other Question

-4-(3+6m)=1/2(4+2m)

Not in a text book. Not sure what to do when you subtract for the distributive property Im used 2 multiplication equations. Can you show all steps to help me? Find the length x. Express your answer in simplified radical form.
51 ft, x, 45 ft