R = 2j - 20

r + j = 85

Question

Mathematics

Celia Anderson

7 February, 12:41

R = 2j - 20

r + j = 85

+2

Answers (2)

Know the Answer?

Lindsey Farley · Answer 1

R=2j-20

r+j=85

j=85-r

j=85 - (2j-20)

j=85-2j+20

j+2j=105

3j/3=105/3

j=35

r=2j-20

r=2*35-20

r=50

Liam · Answer 2

So if r=2j-20 then subsitute 2j-20 for r in second equation

2j-20+j=85

add like terms

3j-20=85

add 20 to both sides

3j=105

divide both sides by 3

j=35

subsitute

r+j=85

r+35=85

subtract 35 from both sides

r=50

r=50

j=35

R = 2j - 20r + j = 85

R = 2j - 20

r + j = 85