Answer:
we are working with simultaneous equations in this form, the best combination of one of the variables is to have them as additive inverses, because their sum is 0.
This is exactly what we have in the equations below.
Adding the equations will eliminate the x terms.
×
2
x
−
5
y
=
11
A
.
+
3
9
B
←
÷
1
we know y, now find x.
Subs in A:
(
)
6
Answer link
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Answers & Comments
Answer:
we are working with simultaneous equations in this form, the best combination of one of the variables is to have them as additive inverses, because their sum is 0.
This is exactly what we have in the equations below.
Adding the equations will eliminate the x terms.
×
×
×
×
2
x
−
5
y
=
11
A
×
×
×
.
−
2
x
+
3
y
=
−
9
B
A
+
B
×
×
×
−
2
y
=
2
←
÷
−
2
×
×
×
×
×
×
x
y
=
−
1
←
we know y, now find x.
Subs in A:
2
x
−
5
y
=
11
×
×
×
2
x
−
5
(
−
1
)
=
11
×
×
×
×
×
2
x
+
5
=
11
×
×
x
.
×
×
×
×
2
x
=
6
×
×
×
×
×
×
×
x
=
3
Answer link