Substitute y into second equation, algebra homework help

please i need in one hour.

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QUESTION 17
4 points
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Solve the system of equations by the substitution method.
y = 2x – 1
4y – 12x = 0
{(-1, -3)}
{(1, -3)}
{(-3,-1)}
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QUESTION 18
4 points
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Solve the system of equations by the substitution method.
X+ y = -6
y = -4x
{(2,8)}
{(-2,-8)}
{(-2, 8)}
{(2, -8)}
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Solve the system of equations by the substitution method.
mt
y = 2x – 6
y = 7x – 7
{(1, -4)}
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QUESTION 20
4 points
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Solve the system of equations by the substitution method.
ОООО
-2x – 3y = -21
x = -5y
{(-3, 15)}
{(16,-3)}
{(15,3)}
{(15,-3)}
]
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QUESTION 21
4 points
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Solve the system by the addition method.
2x + 20y = -144
11x + 5y = 48
{(11, -11)}
{(8,-8)}
{(-8, 8)}
O {(-5, 8)}
QUESTION 22
4 points
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Solve the system by the addition method.
2x + 24y = -110
8x + y = 10
{(-6,5)}
{(8,-8)}
{(5,-5)}
{(-5,5)}
QUESTION 23
4 points
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QUESTION 23
4 points
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Solve the system of equations by the substitution method.
-3x – 4y
= -10
x – 2y = 0
{(3, 1)}
{(2, -1)}
{(1, 2)}
{(2, 1)}
QUESTION 24
4 points
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Solve the system by the addition method.
-2x – 7y = -31
7x – 3y = -29
{(-2,-5)}
{(2,5)}
{(2,-5)}
{(-2,5)}
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{(-2,5)}
10
QUESTION 25
4 points
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Solve the system by the addition method.
5
-7x + 9y = -22
-2x – 2y = 12
{(-3, -3)
{(-2,-3)}
{(-2,-4)}
✓
✓
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