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SAT Math Practice: Substitution Practice 01

Solve the following system of equations by using substitution.

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1. Solve using substitution:
$3x-6y=15$
$y=4$

$(-6,4)$

$(13,4)$

$(4,2)$

$(0,4)$

2. Solve using substitution:
$4x-5y=8$
$-2x-y=10$

$(-3,-4)$

$(2,9)$

$(-11,0)$

$(4,-7)$

3. Solve using substitution:
$3y-3x=-9$
$-10x+6y=-2$

$(1,5)$

$(15,-2)$

$(-8,13)$

$(-4,-7)$

4. $x^2+y^2=1000$
$y=3x$
If $(x,y)$ is a solution to the system of equations above, what is the value of $x^2$ ?

$10$

$30$

$100$

$900$

5. $(x-1)^2+y^2=50$
$y=-x-1$
If $(x,y)$ is a solution to the system of equations above, what is the value of $y^2$ ?

$5$

$16$

$25$

$36$

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