Using the substitution of (y=y) what is y= -3x+5 y= -2x+3 (pls help this is)

x = 2 and y = -1

Step-by-step explanation:

y = -3x + 5

y = -2x + 3

-3x + 5 = -2x + 3

Add 2x to both sides;

-x + 5 = 3

Subtract 5 from both sides;

-x = -2

Divide both sides by -1

x = 2

Solve for y;

y = -3x + 5

y = -3(2) + 5

y = -6 + 5

y = -1

answer: correct

step-by-step explanation:

x^2 + 81

we can factor this using difference of square binomials.

rewrite the equation:

x^2 - (-81)

factor:

(a^2 - b^2) = (√a^2 + √b^2)(√a^2 - √b^2)

(x^2 - (-81) = (x + √-81)(x - √-81)

we can remove the - from under the radical by multiplying it by i.

(x^2 - (-81) = (x + i√81)(x - i√81)

(x^2 - (-81) = (x + 9i)(x - 9i)

we can check our answer by using foil:

x^2 - 9ix + 9ix - 81i^2

x^2 - 81^2

i^2 = -1

x^2 + 81