-2a + 5 = 1
-2a = -5 + 1
-2a = -4
a = -4/-2
a = 2
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a = 1
a = 4
1
a2 + 2a - 3 = 0(a + 3)(a - 1)a = - 3a = 1Simple factoring where you ask yourself; what two factors of - 3 add up to 2?
(1) Add the two equations together & solve for A:A - B = 381A + B = 561-------------------2A + 0B = 9422A = 9422A/2 = 942/2A = 471(2) Now substitute A back into one of the original equations & solve for B:A + B = 561471 + B = 561B = 561 - 471B = 90