For the following system, use the second equation to make a substitution for y in the first equation. 2x + y = 5 y + 3 = 2x

Question

Mathematics

River Morrow

22 September, 16:40

For the following system, use the second equation to make a substitution for y in the first equation. 2x + y = 5 y + 3 = 2x

+4

Answers (2)

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Glenn Porter · Answer 1

If y equals 2x - 3 in the second equation, than subsitute it in for y in the first.

2x + 2x - 3 = 5

4x - 3 = 5

4x = 8

x=2

2 (2) + y = 5

x = 2 and y = 1

Ainsley Boyle · Answer 2

For the second equation, y=2x-3. Substituting this in, you get 2x+2x-3=5. Add the 2x's (4x), and add 3 to the 5 (8). You should get 4x=8, which will give you x=2.