Question

Solve using Substitution
9x+10y=1
y=-8
(?,?)

Answer 1

x=9,y=8

Explanation:

Step 1: Substitute y=-8 into equation 1

9x+10(-8)=1

9x+(-80)=1

9x=1+80

9x=81

Step 2: Divide both sides by the coefficient of x which is 9 then,

x=9

Step 3: Also substitute x=9 into equation 1

9(9)+10y=1

81+10y=1

10y=1-81

10y=-80

Step 4:Divide both sides by 10 then,

y=-8