remember, you can do anything to an equation as long as you do it to both sides
we can do a subsitution
y=x+6
y=-7x-10
since y=x+6, we can subsitute x+6 for y in the other equation
y=-7x-10
x+6=-7x-10
add 7x to both sides
8x+6=-10
minus 6 from both sides
8x=-16
divide both sides by 8
x=-16/8=-2
the valu eof x that satisfies both equations is x=-2
Answer:
need triangle pic
Step-by-step explanation:
Answer:
x = 9
Step-by-step explanation:
Corresponding sides are in proportion, that is
=
( cross- multiply )
8x = 72 ( divide both sides by 8 )
x = 9
Answer:
Step-by-step explanation:
45h + 75 = 210
45h = 135
h = 3 hours