jacksonyodell8601
28.01.2020 •
Mathematics
Consider the following pair of equations:
y = –2x + 8
y = x – 1
explain how you will solve the pair of equations by substitution. show all the steps and write the solution in (x, y) form.
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Ответ:
y = x - 1 . . . (2)
Equating (1) and (2), gives
-2x + 8 = x - 1
x + 2x = 8 + 1
3x = 9
x = 9/3 = 3
From 2, y = 3 - 1 = 2
Solution is (3, 2)
Ответ:
-2x+8=x-1
add 2x to both sides
8=3x-1
add 1
9=3x
divide 3
3=x
sub
y=x-1
y=3-1
y=2
(x,y)
(3,2)
Ответ:
the correct answer is x=9 or x=-21