Using substitution
x+3y=3
3y-2x=12

Step-by-step explanation:

Given :-

And we need to solve the equation using Substituting method . So on taking the first equation ,

Put this value in (ii) :-

Put this Value in (I) :-

Hence the Value of x is 21 and y is (-6) .

first one

step-by-step explanation:

x = 10.1

step-by-step explanation:

all of the angles of a tirangle add up to 180º

180 - 65 = 115 (since we already know the value of one angle)

(2x + 7) + (8x + 7) = 115

(combins like terms) 10x + 14 = 115

(isolate the variable subtract 14 from both sides): 10x = 101

(find the variable divide both sides by 10): x = 101/10

x = 10.1