Answer: D. <DXC is a right angle
Step-by-step explanation:
Answer:
4x +y = 11
Step-by-step explanation:
)
y - 3 = -4(x - 2)
y - 3 = -4x + 8
4x + y -3 = 8
4x + y = 8+3
4x + y = 11
Total cost = $13.05 + 10.26
= $23.31
Indivdual pay = $23.31 / 3
= $7.77 each
Explanation:
3
x
+
y
=
2
−
x
−
3
y
=
6
⇒
−
6
−
3
y
=
x
Substitute this equation into the other system wherever you see
x
.
3
(
−
6
−
3
y
)
+
y
=
6
Distribute
3
onto
(
−
6
−
3
y
)
−
18
−
9
y
+
y
=
2
Combine alike terms
−
8
y
=
20
Divide to solve for
y
−
8
y
−
8
=
20
−
8
⇒
y
=
−
20
8
Then solve for
x
using the value of
y
.
−
x
−
60
8
=
6
x
=
−
108
8
y
=
−
20
8
