Solve the system of equations using substitution. 3x + 2y = 7 y = –3x + 11
3x + 2y = 7 y = –3x + 11 Sub –3x + 11 into y in the 1st equation: 3x + 2(–3x + 11) = 7 3x - 6x + 22 = 7 -3x = 7 - 22 -3x = -15 x = -15/-3 x = 5 Sub x = 5 into any equation: y = –3(5) + 11 y = -15 + 11 y = -4 Solution set: (5, -4)
Question
Updated 1/23/2016 12:43:48 AM
Edited by Andrew. [1/23/2016 12:42:03 AM]
Rating
3
3x + 2y = 7
y = –3x + 11
Sub –3x + 11 into y in the 1st equation:
3x + 2(–3x + 11) = 7
3x - 6x + 22 = 7
-3x = 7 - 22
-3x = -15
x = -15/-3
x = 5
Sub x = 5 into any equation:
y = –3(5) + 11
y = -15 + 11
y = -4
Solution set: (5, -4)

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