Question

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Answer 1

x + y =5 .......eqn (1)

x - y =3 .......eqn(2)

using substitution method

x + y = 5

-

x - y = 3

0 + 2y=2

y = 2/2

y = 1

substitute y in egn(1)

x + 1 = 5

x = 5-1

x = 4

then (x, y) = (4,1)

Answer 2

23: B, 155.00

D=7 so 5(7)+120 is 155


25: D (2,6)

(X,y) if you plug in the 2 and 6 the equations make sense

26: A (4,1)

Same as 25

27; b, 2x+y=2 and 4x - y=3

The x value and y value have the same value in both equations