Substitution:

2x+4=y

4y-18x=5

(7/8,23/4) or (0.875,5.75)

x=7/8 or 0.875

y=23/4 or 5.75

Step-by-step explanation:

2x+4=y

4y-18=5

substitute the value of y into an equation

4 (2x+4) - 18=5

multiply 4 to 2x and multiply 4 to 4

8x+16-18=5

subtract 16 to 18

8x-2=5

add 2 to 5

8x=7

divide both sides by 8

x=7/8 or 0.875

substitute the value of x into an equation

4y-18=5

add 18 to 5

4y=23

divide both sides by 4

y=23/4 or 5.75

(7/8,23/4) or (0.875,5.75)