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

that there are 12 data points

step-by-step explanation:

option a, c,d are correct.

step-by-step explanation:

from the given figure, it is given that z is equidistant from the sides of the triangle rst, then from triangle tzb and triangle szb, we have

tz=sz(given)

bz=zb(common)

therefore, by rhs rule,δtzb ≅δszb

by cpctc, sz≅tz

also, from δctz and δasz,

tz=sz(given)

∠tcz=∠saz(90°)

by rhs rule, δctz ≅ δasz, therefore by cpctc, ∠ctz≅∠asz

also,from δasz and δzsb,

zs=sz(common)

∠zbs=∠saz=90°

by rhs rule, δasz ≅δzsb, therefore, by cpctc, ∠asz≅∠zsb

hence, option a, c,d are correct.