Question

(50a +10b =20) + (30a - 10b = -4)​

Answer 1

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Answer 2

Answer:

Solve by Substitution :

// Solve equation [2] for the variable a

[2] 30a = 10b + 200

[2] a = b/3 + 20/3

// Plug this in for variable a in equation [1]

[1] 50•(b /3+20/3) + 40b = 500

[1] 170b/3 = 500/3

[1] 170b = 500

// Solve equation [1] for the variable b

[1] 170b = 500

[1] b = 50/17

// By now we know this much :

a = b/3+20/3

b = 50/17

// Use the b value to solve for a

a = (/3)(50/17)+20/3 = 130/17