Question 1022820
4.25x - 1.28y = -9.2
 x + 1.28y = 17.6  multiply both sides of this equation times -4.25 and add to the one above:
4.25x - 1.28y = -9.2
+
-4.25x - 5.44y = -74.8
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. . .  -6.72y = -84 divide both sides by 6.72 (remember: -/- = +)
y = 12.5 Now find x:
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x+1.28(12.5) = 17.6
x+16 = 17.6
x = 1.6
There you have it. Check the answers by substituting in the equations, I'll do one you do the other:
4.25x-1.28y = -9.2
4.25(1.6)-1.28(12.5) = -9.2
6.8-16 = -9.2 Subtract on left to see that this is correct. You do the other equation.