How do you solve #4x + y = 26# and #5x - 2y =13#?

1 Answer
Jul 8, 2018

Answer:

The solution is the point #(5,6)#.

Explanation:

Equation 1: #4x+y=26#

Equation 2: #5x-2y=13#

We can use addition/elimination and substitution to solve this system.

Multiply Equation 1 by #2#.

#2(4x+y)=26xx2#

Simplify.

#8x+2y=52#

Add Equation 1 and 2.

#8x+2y=52#
#5x-2y=13#
#-----#
#13x##color(white)(.......)=65#

Divide both sides by #13#.

#x=65/13#

#x=5#

Substitute #5# for #x# in Equation 2 and solve for #y#.

#5(5)-2y=13#

#25-2y=13#

Subtract #25# from both sides.

#-2y=13-25#

#-2y=-12#

Divide both sides by #-2#.

#y=(-12)/(-2)# #larr# Two negatives make a positive.

#y=6#

The solution is the point #(5,6)#.

graph{(4x+y-26)(5x-2y-13)=0 [-9.33, 10.67, 0.08, 10.08]}