3 years ago

When solving the system x + 2y = 9 and x - y = 6 by substitution, what can be substituted for x in the second equation?

1 answer:

8 0

X+2y = 9 ---------eq.1
x-y =6 ----------- eq.2

x = 9 -2y (from eq. 1)

Now substitute the value of x in the second eq.2

9-2y-y =6
-3y = -3
y =1

So,
x +2 (1)= 9
x= 7

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