Using both elimination and substitution methods solve the
following systems of equations (simultaneous equation)
a) y + 2x = 10
y - 2x = 12

b) 2y + x = 10
2y - x = 12

c) 3y - 2x = 15
3y + 2x = 9

d) 2x + 2y = 12
2x - 2y = 12

e) 6x + 4y =20
3x + y = 3

f) y + x = -10
2x -3y = 0

answer: b.

step-by-step explanation:

it is b. cause the equations are put in the right category

pls ask

if you are saying purchasing 3 social media ads and one newspaper ad counts as one purchase then there are:

6 purchases

if you are asking how many of each then:

18 social media ads

6 newspaper ads

step-by-step explanation:

step 1: solve one of the equations for one of the variables. let's solve the first equation for y:

step 2: substitute that equation into the other equation, and solve for x.

step 3: substitute x = 4 x = 4 x=4 into one of the original equations, and solve for y.