book Maths Puzzle Numerical Ability

Factor the equation

10(y+7)-x(y+7)

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book Other Question

Can anyone answer this?
Fifty students were asked their favorite season.Thirty saaid summer,15 said winter and the rest spring or fall.In a circle graph what would the measure of each central angle be? Solve each system by the addition method
x + y = 13
22x + 36y = 356

Solve each system by the addition method. Determine whether the equations are independent, dependent, or