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dybincka [34]
2 years ago
9

Solve the system of equations by using substitution.​

Mathematics
1 answer:
katrin [286]2 years ago
8 0

Answer:

(x,y) = (-1,1)

Step-by-step explanation:

Given the equations

y = 2x + 3

x - y = -2

substitute the value of y in the first equation into the second

x - (2x + 3) = -2

x -2x - 3 = -2

-x - 3 = -2

add 3 to both sides

-x = -2 + 3

- x = 1

Divide both sides by -1

x = -1

Substitute into the first equation

y = 2(-1) + 3

y = -2 + 3

y = 1

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Answer:

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Step-by-step explanation:

Equation of a line is y = mx + c, m is the gradient and c is the intercept

The line passes through points 4 and -5, x is 4 and y is -5

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When two lines are perpendicular, the products of their gradients are equal to -1, m1 * m2 = -1

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