Answer:
Step-by-step explanation:
Five students= 5x
They all got two more= 5x + 2(5)
5x + 10 = 30
<u> - 10 -10</u>
<u>5x = 20</u>
5
x = 4
Tanx-5=0
tanx=5
tan inverse (5)=x
78.69
Answer:
Step-by-step explanation:
exterior angle=sum of opposite two interior angles=70+50=120°
c.
120=50+?
?=120-50=70°
7x + 9y = - 27_________eq1
3x - y = 3__________eq2
Multiply eq 2 by 9 and then add the resulting eq with eq1.
eq2 x 9 gives us 27x - 9y = 27___________eq3
add eq3 with eq1 we get.
34x = 0.
where x=0/34
x=0.
substitute x into any of the above equations to get y.
substitute x into eq1. we get:
7(0) + 9y =-27
9y = -27
y= -27/9
y = -3.
38
because since all abc and xy have the same coefficients it makes it easier.
i just made a=-2, b=-4,and c=4 because when added up it equals -2
i also made both x and y =5 becasue when added up it equals 10
so, -9(-2)+2(5)-9(-4)-9(4)+2(5)
18+10+36-36+10=38
