If 2x + 5y = 21 and x + y = 3, then what is the value of x?

a x=-5

b x=2

c x=5

D x=-2

Question

Mathematics

Eliana Watson

21 August, 19:53

If 2x + 5y = 21 and x + y = 3, then what is the value of x?

a x=-5

b x=2

c x=5

D x=-2

+2

Answers (2)

Know the Answer?

Osvaldo Valencia · Answer 1

Osvaldo Valencia 21 August, 20:32

0

The answer in the math is D

Cochran · Answer 2

D

Step-by-step explanation:

Given the 2 equations

2x + 5y = 21 → (1)

x + y = 3 → (2)

Rearrange (2) expressing y in terms of x, by subtracting x from both sides

y = 3 - x ← Substitute into (1)

2x + 5 (3 - x) = 21 ← distribute and simplify left side

2x + 15 - 5x = 21

- 3x + 15 = 21 (subtract 15 from both sides)

- 3x = 6 (divide both sides by - 3 x = - 2 → D

If 2x + 5y = 21 and x + y = 3, then what is the value of x?a x=-5b x=2c x=5D x=-2

If 2x + 5y = 21 and x + y = 3, then what is the value of x?

a x=-5

b x=2

c x=5

D x=-2