Question 601434
 the equation is {(3x+4y=48,x-y=2)  this is how the teacher wrote it out on my assignment. The answers given were x=40 and y=42 I need to understand how these numbers were gotten and the book is no help. I am visual and there are no examples close to this problem. 
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Firstly, that's not an equation.  It's 2 equations, called a system of equations.
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2nd, 40 & 42 are not the answers.
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3x+4y=48
x-y=2 --> x = y+2
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Sub for x in the 1st eqn
3(y+2) + 4y = 48
6y+6 + 4y = 48
7y = 42
y = 6
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x = y+2
x = 8