X=40
x+2=42
x+x+2=82
2x=80
x=40
Answer:
I agree with the student's answer. "x" cannot be -2 because then it would make -20 which is not equal to 20:
5(-2)(2) = ?
-10 x 2 = ?
? = -20
-20 ≠ 20
Step-by-step explanation:
Justificaiton:
5(x)(2) = 20
10(x) = 20
10/10(x) = 20/10
x = 2
Second Justification:
5(x)(2) = 20
5/5(x)(2) = 20/5
2x = 4
2x/2 = 4/2
x = 2
A very quick way of solving this problem is to recognize and use the fact that a line parallel to 5x-2y=2 has an equation which is exactly the same as 5x-2y=2 except for the constant.
Replace that 2 (on the right side of the equation) with C, and x with -4, and y with -3:
5(-4)-2(-3)=C
and find C. C = -20 + 6 = -14.
Therefore, the equation of the line parallel to 5x-2y=2 passing thru the point (-4, -3) is 5x-2y= -14. Notice how only the constant changes.
Answer:
kite
Step-by-step explanation:
a kite has 4 sides like a quadrilateral has to have to be a quadrilateral while a triangle has only 3 sides.
Answer:
3
Step-by-step explanation:
Using the rule of exponents
=
Given
= ×
= 3 ×
= 3