If 2x + 5y = 10 and x = 3y + 1, what is 11x + 11y?

You have to solve the two equations by eliminating x or y

2x+5y=10

x-3y=1

Multiply all terms of second equation by two and subtract from first equation, thus eliminating x

2x+5y-2x+6y=10-2

11y=8

y=8/11

x=3y+1=3 * 8/11+1=25/11

11x+11y = 11*25/11 + 11*8/11

= 25+8=33