Question

1.solve the following system using substitution method
1.2x-y=7
y=x-3​

Answer 1

Answer:

x = 20, y =17

Step-by-step explanation:

1.2x - y = 7 i)

y = x - 3 ii)

put ii) in i)

1.2x - (x-3) = 7

1.2x - x + 3 = 7

1.2x - x = 4

0.2x = 4

x = 20

put the value of x in ii)

y = x - 3

y = 20-3

= 17