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13-03-2018
Mathematics

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solve the system of equations by substitution y=5x-13 and 5x+2y=19

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13-03-2018

y = 5x - 13 ----------- (1)
5x + 2y = 19 --------- (2)

Sub (1) into (2):

5x + 2(5x -13) = 19
5x + 10x - 26 = 19
15x = 19 + 26
15x = 45
x = 3 -------- sub back into (1)
y = 5(3) - 13
y = 15 - 13
y = 2

Ans: x = 3, y = 2

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