15-20 is -5. If you put 15 on a number line and go back twenty spaces you land on -5 hope this helps.
11 by 16
Explanation:
Set up two equations
2
x
+
2
y
=
54
x
×
y
=
176
Solving the first equation for x
2
x
+
2
y
−
2
y
=
54
−
2
y
this gives
2
x
=
54
−
2
y
Divide both sides by 2
(
2
x
2
)
=
54
−
2
y
2
This gives.
x
=
27
−
y
putting this value into the second equation gives.
(
27
−
y
)
×
y
=
176
multiplying across the parenthesis gives
27
y
−
y
2
=
176
subtracting 176 from both sides gives
is
27
y
−
y
2
−
176
=
0
multiplying by negative one gives
−
27
y
+
y
2
+
176
=
0
factoring this into y gives
(
y
−
11
)
×
(
y
−
16
)
=
0
Solving for both y's gives
y
=
11
,
y
=
16
10/5÷5/5=2/1 or 2 so all you had to do was put the numbers over each other and simplify
Answer: x=2
Step-by-step explanation: Subtract
3
3
3
from both sides of the equation
2
+
3
=
+
5
2
x
+
3
=
x
+
5
2x+3=x+5
2
+
3
−
3
=
+
5
−
3
2
x
+
3
−
3
=
x
+
5
−
3
2x+3−3=x+5−3
2
Simplify
Subtract the numbers
Subtract the numbers
2
=
+
2
2
x
=
x
+
2
2x=x+2
3
Subtract
x
x
from both sides of the equation
2
=
+
2
2
x
=
x
+
2
2x=x+2
2
−
=
+
2
−
2
x
−
x
=
x
+
2
−
x
2x−x=x+2−x
4
Simplify
Combine like terms
Multiply by 1
Combine like terms
