yes i agree with her because elimination method is more simpler and shortest method to solve system of equations.
elimination method use to multiply of both equation in order to balance the variable x or y and then equate them.
example
x+2y=7 .....equation 1
x-3y=14 .......equation 2
so you can multiply equation 1 by -1 in order to equate x and get the value of y by saying equation 1 minus equation 2.
Answer:
the formula of a trapezoid is
H(a+b/2)
A= side 1 (usually the two parallel sides, choose one)
b= side 2 (same thing as A but the second line)
The h is height
So we fot 10 and 9
10+9=19
19/2=9.5
9.5*6
57
the Area is 57
Also you drew it wrong (look at image)
4+x=(4/3) x 4 — you multiply both sides by 4 to get rid of the fraction on the left.
4+x=16/3 — then simplify the fraction on the right
x = 1 1/3 — minus 4 from both sides to get x alone
We use the law of Cosines to be able to find : 1. The measure of the
third side, when the measure of two sides and the included angle of a
triangle ABC are known. 2. The measure of any angle, when the measure of
the three sides of a triangle ABC are known.
The Law of Cosines is c² = a² + b² - 2abcosΘ. It has four variables;
a, b, c and Θ. Whenever you have a triangle with three of these
variables known, use the Law of Cosines to calculate the unknown
variable.