Which of the following could be the first steps toward solving the system,4x+y=30, -12x+2y=20
?
select all that ! select all that
a)multiply the second equation by 2 and then add.
b)multiply the first equation by 2 and then subtract.
c)divide the second equation by 2 and then subtract.
d)multiply the second equation by 3 and then subtract.

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.

for this case we have by definition, if two lines are perpendicular, then the product of their slopes is -1.

then, given the following line:

so,

we are looking for m_ {2}:

then, the line is given by:

we find "b" replacing the given point:

finally, the equation is:

option c