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Lane Willis
Mathematics
8 October, 03:19
8a - 4b = 20
5a - 8b = 62
What are the values of a and b?
+4
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Hunter Solomon
8 October, 03:24
0
a=2, b = (-1)
Step-by-step explanation:
8a-4b=20 / * (-2)
5a-8b=62
-16a+8b = - 40
5a-8b=62
now - 8+8=0 right? so the only parameter that we have is a.
-16a+5a = - 40+62
11a = 22 / (:11)
a=2
in order to find b, we will replace a with its value in one of the original equations (it doesn't matter which one you will choose). For instance, I chose the first one.
8*2-4b=20
-4b=20-16
-4b=4/: (-4)
b = - 1
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