Answer:
A) x = -7 .
Step-by-step explanation:
Given : f(x) = 2.8x - 12
g(x) = 5.8x + 9.
To find : What is the x-coordinate at the point of intersection for these equations.
Solution : We have given that
y = 2.8x - 12 ------- ( equation 1)
y = 5.8x + 9--------( equation 2)
On subtracting equation 2 from equation 1.
y = 2.8x - 12
(-)y = (-)5.8x +(-) 9
______________
0= - 3x - 21
On adding 21 both sides
21 = -3x
On dividing both sides by -3 and switching sides .
x = -7 .
Therefore, x = -7 .
Answer:
x=-7
Step-by-step explanation:
what it is basically saying is:
2.8x-12=5.8x+9
so add 12 on both sides to eliminate the -12
which will leave with:
2.8x=5.8x+21
Now we have to eliminate 5.8x so subtract 5.8x on both sides which leaves us with:
-3x=21 (because 2.8-5.8=-3 and 5.8-5.8=0)
so now we divide both sides by -3 which leaves us with:
x=-7 (because 21 divided by 3 equals 7 so 21 divided by -3 equals -7)
