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Cruz
Mathematics
31 May, 07:58
Y=3x-5
3y-12x=-6
Substitution method
+2
Answers (
2
)
Ashlynn Hammond
31 May, 08:16
0
1y = 3x - 5 ⇒ 1y - 3x = - 5 ⇒ 3y + 9x = 15
3y - 12x = - 6 ⇒ 3y - 12x = 6 ⇒ 3y - 12x = 6
21x = 21
21 21
x = 1
y - 3 (1) = - 5
y - 3 = - 5
+3 + 3
y = 2
(x, y) = (1, 2)
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Ross Phillips
31 May, 08:17
0
Replace all occurrences of y with the solution found by solving the last equation for y. In this case, the value substituted is 3x-5.
y=3x-5
3 (3x-5) - 12x=-6
Simplify each term.
y=3x-5
9x-15-12x=-6
Add 9x and - 12x to get - 3x.
y=3x-5
-3x-15=-6
move - 15 to the right-hand side of the equation by adding 15 to both sides.
y=3x-5
-3x=15-6
Subtract 6 from 15 to get 9.
y=3x-5
-3x=9
Simplify
(-3,-14)
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