21-02-2017
Mathematics

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4x-7y=10 y=x-7 using the substitution method

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texaschic101 texaschic101

21-02-2017

y = x - 7...so we sub in x - 7 for y in the other equation

4x - 7y = 10
4x - 7(x - 7) = 10
4x - 7x + 49 = 10
4x - 7x = 10 - 49
-3x = - 39
x = -39/-3
x = 13

y = x - 7
y = 13 - 7
y = 6

solution is (13,6)

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