Question

A system of linear equations is shown below.

5X = 3y - 2
y = X + 4

What is the x -coordinate of the solution?

a.) 2
b.) 4 *****
c.) 5
d.) 1


Jean needs to graph the function below.

y = 7x ^2 + 8x -6

How many times should the graph of this function intersect the x-axis?


a.) 3
b.) 2 ******
c.) 1
d.) 0

Answer 1

first no I get x = 5
5X = 3y - 2
3y = 3X + 12
----------------add
5 x + 3 y = 3 x + 3 y + 10

2 x = 10
x = 5

Answer 2

y = 7x ^2 + 8x -6
we need to make sure solution is real and not repeated

look at b^2-4ac
64 + 168
positive so sqrt of + number,
you are right, two real zeros

Answer 3

Thanks Damon for checking my answers!
:-)

Answer 4

You are welcome :)

Answer 5

Psst