<PRE><B>Question 662280</B>
Solve the system by the substitution method

4x + y = 25
3x + 4y= 22
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Solve for y in the 1st equation: 
y = 25 - 4x
Substitute the value for y in the 2nd equation:
3x + 4(25-4x) = 22
3x + 100 - 16x = 22
13x = 78
x = 6
So y = 25 - 4*6 = 1
Ans: x=6, y=1</PRE>