SOLUTION: Solve the following system. Find the sum of the x and y solutions. x - y = 7 4x - 5y = 25 a) 15 b) 13 c) 11 d) 9 e) none of the above

SOLUTION: Solve the following system. Find the sum of the x and y solutions. x - y = 7 4x - 5y = 25 a) 15 b) 13 c) 11 d) 9 e) none of the above

Algebra.Com

Question 59848: Solve the following system. Find the sum of the x and y solutions.
x - y = 7
4x - 5y = 25
a) 15
b) 13
c) 11
d) 9
e) none of the above
Answer by checkley71(8403) (Show Source): You can put this solution on YOUR website!
X-Y=7 OR X=7+Y
4X-5Y=25 SO
4(7+Y)-5Y=25
28+4Y-5Y=25
-Y=-3
Y=3 THEN
X-3=7
X=7+3
X=10
PROOF
4*10-5*-3=25
40-15=25
25=25
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