Question

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y=4x and y+x=5

A. (-4,1)
B. (1,4)
C. (-3,2)
D. (2,3)

Answer 1

B

Answer 2

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Answer 3

y = 4x Equation(1)
x+y=5 Equation (2)

Sub. (1) into 2:
x + 4x = 5
5x = 5
x = 1

Sub. into (2)
x + y = 5
1 + y = 5
y = 4