Book Maths Puzzle Algebra

A farmer raises wheat and oats on 180 acres. She plants wheat on 20 more acres than she plants oats on. How many acres of each crop does the farmer plant? and Enrico says, \"I\'m Thinking of 2 mystery numbers. One number is 3 times the other. The sum of the two numbers is 48\". What are Enrico\'s mystery numbers? Please help me!

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Book Other Question

Hello, how do i graph the equation 2x+3y=6. Question: how I can solve this equation.
x + y^(.5) = 7
y + x^(.5) = 11
I know the answer of these equations but don,t know how to solve?
meance in first equation just y plus x to the power .5 and in second equation swap x and y.
answer is x = 4 ...... and y = 9
but i want to know the method for solving this equation :-)