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5 votes
X + 7y = 64
x + 3y = 28

User Pedro LM
by
8.4k points

1 Answer

4 votes

Answer:

x = 81.99

Explanation:

x + 7y = 64

7y = 64 - x (1)

x + 3y = 28

3y = 28 - x (2)

From equation (1) and (2)

7y = 64 - x

3y = 28 - x

Substituting 7y by 64 - x in equation (2)

3(64 - x) = 28 - x

192 - 3x = 28 - x

Adding x to both sides

192 - 2x = 28

Subtracting 28 from both sides

164 - 2x = 0

Divide both sides by 2

82 - x = 0

Adding x to both sides

82 = x

Substituting x by 82 in equation (1)

7y = 64 - 82

7y = -18

Divide both sides by 7

y = -18/7

y = -2.57

Substituting y by -2.57 in equation (1)

x + 7(-2.57) = 64

x - 17.99 = 64

Adding 17.99 to both sides

x = 81.99

User Nowaker
by
8.0k points

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