Question 650978
6x + 5y = 7      &        x - y = 3 
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apply the "substitution method", solve the right equation for x:
x - y = 3
x = y+3
substitute above into the left equation to find y:
6x + 5y = 7
6(y+3) + 5y = 7
6y+18 + 5y = 7
11y+18 = 7
11y = -11
y = -1
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substitute above into the right equation to find x:
x - y = 3
x - (-1) = 3
x + 1 = 3
x = 2
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solution: (x,y) = (2, -1)