Question

(d) 20x*y® z by-4x:​

Answer 1

Step-by-step explanation:

substitute it in the other one.

Let's isolate

x

in the first equation and then substitute it in the second one:

x

=

7

−

y

Then

2

(

7

−

y

)

+

3

y

=

20

14

−

2

y

+

3

y

=

20

y

=

6

If

y

=

6

and

x

=

7

−

y

, then

x

=

7

−

6

,

x

=

1

!

There you have:

x

=

1

and

y

=

6

!

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