Question

solve using two different methods for 7x-3y=20 and 5x+3y=16 explain which method you found more efficient

Answer 1

the elimination method is best here
just add the 2 equations and the 3y will disappear
and you can quickly find value of x

Answer 2

Add the two equations together. The 3y terms will subtract out leaving 12x = 36.

Answer 3

add both equatios u will get the value of x and put the value of x in any equation to get the value of y

Answer 4

then find the value of y by substituting back in one of the original equations

Answer 5

the other method is by substitution
from the first equation
x = ( 20 +3y) / 7

plug this value for x into the second equation and solve for y

then substitute back into one of the original equations to find x

the elimination method is much easier for this problem