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5x+y=2x2+6, y+4x=7x-2
solve by using substitution method

1 Answer

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Answer:

2x^2+3x+8=0. solve the problem by using the quadratic formula

Explanation:

From the first equation, we can rewrite it as y = 2x^2 + 6 - 5x.

Now we substitute this expression for y in the second equation:

(2x^2 + 6 - 5x) + 4x = 7x - 2.

Simplifying, we get 2x^2 + 10x + 6 = 7x - 2.

Rearranging, we have 2x^2 + 3x + 8 = 0.

Unfortunately, this equation doesn't factor easily. We can use the quadratic formula to find the solutions for x.

User Tom Marthenal
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