Super i need ! 1 ! use the linear combination method to solve the system of equations. explain each step of your solution. 3x-8y=7" " " " x+2y=-7

x=-3,y=-2

Step-by-step explanation:

Given 2 expressions

S1:

S2:

Write one equation in terms of any variable (x or y)

Here I am writing S1 in terms of y

Substitute this value of y as the value of y in S2

⇒

Therefore

Substitute this value of x in any of the expressions S1 or S2

Here i am substituting in S2

⇒

Therefore x=-3 and y=-2

check the picture below.

well, the angle at the vertex d is clearly not a right-angle, let's check for the one at the vertex f which does look like,   however if it's indeed, that means ef is perpendicular to df, in which case their slopes will be negative reciprocal of each other.

so the negative reciprocal of the slope of ef is 1, however the slope of df is not 1, is 1/2, so nope, they're not perpendicular lines.