Solve the system of linear equations by graphing. y = –5/2 x – 7 x + 2y = 4 what is the solution to the system of linear equations?
a(–4.5, 4.25)
b(–1.7, –2.8)
c(0, –7)
d(3, 0.5)

Keywords

system; linear equations; graphing; solution

we have

-------> equation A

----> equation B

The system of linear equations is composed of equation A and equation B

Substitute the equation B in equation A

Find the value of x

The solution is the point

Using a graphing tool

see the attached figure

therefore

the answer is the option A

(b) 240

step-by-step explanation:

first, we use the pythagorean formula using the given side lengths to find x. then we use x to find the side lengths. then we add the side lengths to find the perimeter.

pythagorean theorem formula:

a^2 + b^2 = c^2

(x - 20)^2 + (x - 40)^2 = x^2

x^2 - 40x + 400 + x^2 - 80x + 1600 = x^2

x^2 -120x + 2000 = 0

(x - 100)(x - 20) = 0

x - 100 = 0 or x - 20 = 0

x = 100 or x = 20

we see that the solution x = 20 must be discarded because it will give a negative side length and a side length of 0. the only valid solution is x = 100.

perimeter = sum of the lengths of the sides

perimeter = x + x - 20 + x - 40

perimeter = 3x - 60

replace x with 100.

perimeter = 3(100) - 60

perimeter = 300 - 60

perimeter = 240