2z - 5 = 11
Add 5 to both sides: 2z = 16
Divide both sides by 2: z = 8
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x = 5, y = -1
-2x+5 x=-3 --original equation-2(-3)+5 --use substitution property6+5 --solve.11 --final answer is 11.
b = 2a + 11a + b = 5 which is b = 5 - atherefore2a + 11 = 5 - a (which is b = b)2a + a = - 11 + 53a = - 6a = - 2looking at first equation substitute - 2 for a:b = 2a + 11b = 2*(- 2) + 11b = - 4 +11b = 7to check:a + b = 5- 2 + 7 = 5
1/5+1/11 = 11/55+5/55 = 16/55
-2 + 5 = xsame as:5 - 2 = xx = 3