Question

-4=2/5 *x
a.10
b.-10
c.-1
d.1

Answer 1

first change the problem around so it looks like -4 = 2x/5 then you mutliply 5 on both sides

5 x (-4) = 2x/5 x 5

Answer 2

5 x (-4) = 2x

what is 5 x (-4)?

Answer 3

5 x (-4) = -20
so now we have

-20 = 2x

Answer 4

now we just need to dide 2 on both sides

-20/2 = 2x/2

-20/2 = x

Answer 5

so what is -20/2?

Answer 6

-10 thank you so much i have a 2 more i need help on

Answer 7

okay and no problem

Answer 8

which equation is an identity?
a.8-(5x+2)=-5x-6
b.7z+10-z=8z-2(z-5)
c.8m-4=5m+8-m
d.6y+5=6y-5

which equation has no solution?
a.7v+2=8v-3
b.3x-5=3x+8-3
c.4y+5=4y-6
d.7z+6=-7z-5

Answer 9

learn abou identities here - http://www.mathsisfun.com/definitions/identity.html

not sure about the second one

Answer 10

alright thank you

Answer 11

no problem